Installation & Updates

The eXpress App

Click the button to download the eXpress app for PC, phone, tablet, or open the web version:

You can use eXpress on an unlimited number of devices. System requirements and installation instructions for each platform are listed below.

The eXpress Corporate Desktop App

The corporate version of the eXpress desktop app — eXpress Corporate — has one key difference: works only with the corporate server — you cannot use a public account.

Special Client App for ETS

If your organization uses ETS, a separate branded app with a different name but with eXpress functionality is created for it.

Before getting started:

1. Obtain your ETS app credentials from your organization
2. Check the workstation requirements
3. Review your organization's user guide

How Does The ETS App Differ From eXpress?

• Works only with the corporate server — you cannot use a public account
• Some features may differ from the regular eXpress app
• Additional restrictions may apply (e.g., screenshots may be prohibited on mobile platforms)
• The ETS app is distributed and updated by the customer organization
• Digital certificates installation may be required on the client devices

Can I Log Into eXpress With ETS App Credentials?

No, you cannot. When attempting to log in to the regular eXpress app with credentials or phone number of the ETS account, you will see the message: “Use the special version of the app”

❓Related Topics:
• Enterprise Transport Server, ETS

How to Track Updates

New versions of client apps and the eXpress server are released regularly. You can track updates on the following resources:

• The “Updates” section on this website
• The #Express - Tech Notifications channel in the app (in Russian for corporate users only)
  
  If you are the first participant from a corporate server, previous channel messages will be unavailable. For details, see the “History and End-to-End Encryption” section.
• The VKontakte community (in Russian)
• The Telegram channel (in Russian)

Updates on Mobile Platforms

Updates are installed automatically when a new version is released in the app store.

Desktop App Updates

ETS App Updates

For branded ETS apps, the customer organization:

• Publishes updates in app stores
• Deploys app to workstations

Client Update Administration

Desktop App Update Algorithm

How automatic updates work:

1. The Auto update app setting is enabled, and there is access to updates.express.ms (ETS app uses its own updates server, if configured).
2. At startup, a timer (6–12 hours) is generated to check for updates. This prevents simultaneous requests from all users.
3. A /settings/server/meta request is sent to CTS or RTS:
   • If the request is successful — check again in 1–10 minutes.
   • If there’s an error — the check is canceled after 20 seconds.
4. When a new version is detected:

   Version	Installation Method
   X.x.x (Major)	A notification is displayed prompting to install.
   x.X.x (Minor)	A notification is displayed prompting to install.
   x.x.X (Patch)	Automatic installation upon restart without confirmation.

Configuring Automatic Updates for Desktop ETS App

Only for desktop app formats that support automatic updates:

1. Create a read-only bucket in a public S3 storage (recommended volume — 10 GB).
2. Place version files from eXpress developers with anonymous access.
3. Provide the bucket link to eXpress for integration into the ETS app build.

Web App Update

Updates for the eXpress web app are performed automatically by the provider itself. If your organization has deployed its own instance of the web app (eXpress or ETS app), the update is performed alongside the server software.

Tools to Motivate Users to Install Updates

There are built-in tools to encourage end users to install updates for client apps.

Server Software Updates

⚠️ For stable app performance, administrators are strongly advised to update server software regularly.

Key points:

• Server software updates are released simultaneously with or after client updates.
• Installation is performed by the organization’s system administrator, technical support, or eXpress implementation specialists.
• Server software lagging behind the client app by more than 3 versions may cause errors, and vice versa.

For detailed update installation instructions, see the administrator guide. If you have technical support — technical support contacts.

❓Related Topics:
• Keep Your App Updated
• UI Alerts (RTS and ETS)
• Update Notification
• Desktop App Does Not Search for Updates Despite a New Version Being Released
• Updating the Android App
• Updating the iOS and iPadOS App
• Updating the Aurora App
• Updating the Windows App
• Updating the macOS App
• Updating the Linux App
• Updating the Web App
• Updating Server Software

Network Resource Access Configuration

The app requires access to the following network resources:

• RTS/ETS and CTS/ECTS servers
• Captcha, links, calls, web apps, updates, etc.
• WebSocket connections to CTS (if traffic inspection/filtering systems are used)

For detailed information, contact your organization's support.

Proxy Server

You can use the app through aт open proxy set up in your device's network settings (works on mobile and PC).

Can I Use Proxies That Require Login?

Proxy servers with authentication are not supported.

Proxy Server Configuration for Desktop App

1. Close the desktop app.
2. Launch the app via terminal or command line:
   "app_path" "--proxy-server=IP:port"
3. It is recommended to create a shortcut to launch the desktop app with a proxy.

Network Requirements

Client-Server Channel Requirements

Call and Conference Requirements

Routing Schemes:

• Between corporate users:
  corp_client1 ↔ CTS server1 ↔ CTS server2 ↔ corp_client2
• With external users:
  corp_client1 ↔ CTS server1 ↔ RTS server ↔ public_client2

Bandwidth Calculation:

• Incoming traffic: 1.5 mbit/s × number of participants
• Outgoing traffic depends on the call type:
  • Video mosaic: 140 kbit/s × number of tiles (max. 20)
  • Audio: 16 kbit/s
  • Screen sharing: 30-50 kbit/s (static content) up to 2 mbit/s (dynamic content)

Minimum Requirements for SIP Voice Calls: 16 kbit/s per participant.

Recommended Nerwork Ping

For calls and conferences: no more than 100 ms.

For messaging: no more than 150 ms.

When these values are significantly exceeded, the app may be unable to connect to the server — for example, when using satellite internet.

Client Device Requirements

❓Related Topics:
• You Are Not Heard in a Call or Conference
• Connection Error; Call Server Error; Kicked from Participants and Other Issues
• Unable to Start Screen Sharing

Time Sync Configuration

For proper operation, time synchronization is required on all client devices and servers. Otherwise, users may encounter login errors, user online status may have wrong future timespamp, or messages will display incorrect timestamps.

How to Configure Time Settings on My Device?

Remote Desktop Operation

When using VDI (VMware Horizon, Citrix) or RDP, additional configuration is required: configuration guide.

Certificate Management

Client Certificates

To use your organization’s own certificates, install the certificate in the device’s OS.

Server Certificates

Installation instructions: administrator documentation.

Certificate Verification

Refer to SSL Certificates Diagnostics.

❓Related Topics:
• Installing Certificates for Android App Operation
• Installing Certificates for iOS/iPadOS App Operation
• Installing Certificates for Windows App Operation
• Installing Certificates for macOS App Operation
• Installing Certificates for Linux App Operation
• Installing Certificates for Web App Operation
• Installing Certificates for Server Software
• Unhandled_service_error | “An Error Occurred” After Entering SMS Code
• “Network Error, Check Server Connection”, “Server with Specified Hostname Not Found”, “Pairing Error” When Scanning QR Code
• “SSL Error”, “Server Connection Error”, “Connection Error” on Android When Entering Phone Number, Email Code, or Corporate Server Address

System Requirements for Android

Installation on Android

Where to get the eXpress app:

• Google Play (except USA and Canada)
• Huawei AppGallery
• RuStore
• APK Installation File

Certificates on Android

⚠️ Starting from version 3.24, only built-in certificates are supported:

• Russian Ministry of Digital Development (by special request for ETS clients)
• Let's Encrypt (including Android 7.0)
• GlobalSign (also for older devices)

For other certificates, contact support.

Language and Spell Check on Android

The interface language matches the system settings. Supported languages: Russian, English, French, German, Spanish, Arabic, Turkish, Indonesian. Spell check uses the system keyboard.

Updating on Android

Automatically via the app store or manually (tap Update in the store or install a new APK).

Uninstallation on Android

Settings > Apps > select the app > Uninstall.

❓Related Topics:
• Issues After Migrating to Another Device
• ROOTED DEVICE Error
• Notifications on Android
• App Logs
• Connection Issues on Android 9+

System Requirements for iOS/iPadOS

Installation on iOS/iPadOS

The app is available in App Store (except for China, the USA, and Canada).

Does the App Work on Apple Silicon Macs?

No, the eXpress mobile app doesn't work on Apple Silicon processor Macs.

Certificates on iOS/iPadOS

To work with corporate certificates:

1. Download the root and cross-certificates.
2. Confirm the download when prompted “The website is trying to download a configuration profile. Allow?”.
3. Select the device for installation (if multiple devices are connected).
4. Go to Settings > Profile Downloaded > Install.
5. Activate trust: Settings > General > About > Certificate Trust Settings.

Language and Spell Check on iOS/iPadOS

The app supports several languages (Russian, English, French, German, Spanish, Arabic, Turkish, Indonesian) and uses the system spell check. To change the language: Settings > select the app > Language.

Updating on iOS/iPadOS

Updates are installed automatically (if enabled in App Store settings) or manually via the Update button in the App Store.

Uninstallation on iOS/iPadOS

Settings > General > Storage > select the app > Delete App.

Complete Uninstallation on iOS/iPadOS

Required for critical errors. Before uninstalling, disable iCloud backups: Settings > [Your Name] > iCloud > Manage Storage > Backups > Documents & Data > disable the app backup.

❓Related Topics:
• iOS Notifications Setup
• iOS Logs

System Requirements for Aurora

Installation on Aurora

Available installation methods:

Certificates on Aurora

Supported certificates:

• Russian Ministry of Digital Development (only in special ETS builds)
• Let's Encrypt
• GlobalSign

⚠️ Third-party certificates are not supported. Contact support for assistance.

Language and Spell Checking on Aurora

The app automatically detects the system language. Available languages:

• Russian
• English

Spell checking is unavailable in the current version.

Updating on Aurora

Manual updates are required for RPM installations. Automatic updates are available for RuStore installations.

Uninstallation on Aurora

To uninstall:

1. Open the list of all apps (swipe up from the bottom edge of the screen).
2. Long-press the app icon.
3. Click the cross that appears.

❓Related Questions:
• Notifications and App Badges on Aurora
• General Logs from Engineering Menu (Aurora)

System Requirements for Windows

App Formats for Windows

Auto-Launching the App on Windows Startup

In the app settings: Settings (avatar button) > Appearance > Launch at system startup.

This setting can be managed during app installation or update.

Auto-Launch on System Startup

Auto-Launch Minimized on System Startup

Installation on Windows

Standard Installation

Installation with Progress Indicator (Unattended)

Silent Installation

Auto-Launch After Installation

Certificate Installation on Windows

Install corporate server certificates to enable connectivity:

1. Open the certificate file and click Install Certificate.
2. Select Place all certificates in the following store > Browse.
3. Enable Show physical stores.
4. Select the store:
   • rootCA → Trusted Root Certification Authorities
   • interCA → Intermediate Certification Authorities
5. Confirm and complete the installation.

Language and Spell Check on Windows

The interface language is determined by OS settings. Available languages: Russian, English, French, German, Spanish, Arabic, Turkish, Indonesian. To change the language: Settings > General > Language.

Uses the built-in OS spell check for the current system language.

Credential Storage on Windows

Authentication data is stored in Windows Credential Manager under *desktop/auth.* entries.

Deleting Keys

If you delete authentication keys from Credential Manager, the authentication screen will appear after restarting the app. Keys are preserved during standard app uninstallation.

Application-Specific Keystore

Beginning with version 3.42, the ETS custom apps support configuration of an independent keystore located in %AppData%\app_name directory. Contact eXpress support to get more details.

Updating on Windows

For apps installed via EXE, automatic updates are available if enabled in settings (details).

For MSI-installed apps, manual installation of the new version is required.

Disabling Update Checks

• Create an AppConfig.ini file in the installation folder and add: [AppConfig] AutoUpdate="false" Update="false" Pre-made file: AppConfig.ini
• Use the MSI installer, where updates are disabled (the INI file is created automatically).
• Use Software Restriction Policies in Windows to block EXE update installers from running in the %LOCALAPPDATA%\express-updater folder.
• Block access to the updates.express.ms resource (ETS app uses its own updates server, if configured).

Closing the App Before Updating

⚠️ Always close the app before updating to avoid additional dialogs or the need to reboot.

Standard Update

In the app with updates available: Settings (avatar button) > Check for updates.
Parameters and keys for manual updates:

Update with Progress Indicator (Unattended)

Silent Update

Update Without Rebooting

Required if updating via MSI while the app is running. The previous version will continue working until reboot.

⚠️ Warning! After reboot, the app won’t launch; repair installation is required. Known issue, fix in progress.

Auto-Launch After Update

Uninstallation on Windows

Closing the App Before Uninstallation

⚠️ Always close the app before uninstalling to avoid additional dialogs or the need to reboot.

Standard Uninstallation

Manually: Settings > Apps > Apps & Features or Programs and Features in Control Panel.
Parameters and keys:

Uninstallation with Progress Indicator (Unattended)

Silent Uninstallation

Uninstallation Without Rebooting

Required if uninstalling via MSI while the app is running. The previous version will continue working until reboot.

Complete App Removal on Windows

Required to resolve critical errors.

1. Close the app and uninstall it (see parameters and keys above).
2. Delete folders:
   • Executable folder: %LOCALAPPDATA%\Programs\eXpress (EXE install) or %PROGRAMFILES%\eXpress (MSI install or EXE install to Program Files)
   • Cache folder: %APPDATA%\eXpress
   • Downloaded updates: %LOCALAPPDATA%\express-updater
   To navigate quickly: copy the path > Win+R > paste the path > Enter. If the folder doesn’t exist, an error will appear.
3. Start menu > search for credential manager > Credential Manager > Windows Credentials > delete all *desktop/auth.* entries.
   
   Alternatively, use a PowerShell script (admin rights required):

   1. Start menu > search for cmd > right-click Command Prompt > Run as administrator.
   2. In Command Prompt, run: powershell Set-ExecutionPolicy RemoteSigned This allows PowerShell script execution.
   3. Download PowerShell script > right-click it in Explorer > Run with PowerShell.
   4. Return to Command Prompt and run: powershell Set-ExecutionPolicy Restricted This restores the default PowerShell execution policy.
4. Delete eXpress.lnk shortcuts (optional) in:
   • %APPDATA%\Microsoft\Windows\Start Menu\Programs (%ProgramData%\Microsoft\Windows\Start Menu\Programs)
   • %HOMEPATH%\Desktop (%PUBLIC%\Desktop)
   • %APPDATA%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar

System Requirements for macOS

App Formats for macOS

Installation on macOS

• Double-click the downloaded *.DMG file.
• In the window that appears, drag the app icon to the Applications folder.
• In the dialog requesting installation from an unknown source, click Allow.

Installing Certificates on macOS

Install corporate server certificates to enable connectivity:

1. Open the macOS Keychain Access app (use Spotlight search to find it).
2. Select System.
3. Drag the certificate file into the Keychain Access app.
4. Enter the computer administrator name and password.

Language and Spell Check on macOS

The interface language is determined by the OS settings. Available languages: Russian, English, French, German, Spanish, Arabic, Turkish, Indonesian. To change the language: Settings > Main settings > Language.

The built-in spell checker from the operating system is used for the current system language.

Credential Storage on macOS

Authentication data is stored in the keychain. To view keys, open the macOS Keychain Access app (use Spotlight search to find it).

Keyring Password

On the first app launch, you’ll be prompted to create a keyring password (if it hasn’t been used before and no password was set). ⚠️ On subsequent app launches, the system may ask for this password again.

Deleting Keys

If you delete authentication keys from the keychain, the authentication screen will appear after restarting the app. When uninstalling the app normally, the keys are preserved.

Application-Specific Keystore

Beginning with version 3.42, the ETS custom apps support configuration of an independent keystore located in ~/Library/Application Support/app_name directory. Contact eXpress support to get more details.

Updating on macOS

Automatic updates are available if enabled in the settings (details).

Disabling Update Checks

Block access to the updates.express.ms resource (ETS app uses its own updates server, if configured).

Standard Update

In the app, if updates are available: Settings (avatar button) > Check for updates.
Manual updates are performed as a standard installation.

Uninstallation on macOS

Standard Uninstallation

1. Close the desktop app: select Quit in the Dock.
2. Open Finder > Applications > find the app and drag it to the Trash > empty the Trash.

Complete App Removal on macOS

Required to resolve critical errors.

1. Uninstall the app using the standard method.
2. Open the macOS Keychain Access app (use Spotlight search to find it).
3. Delete keys starting with eXpress.
4. Delete the folder:
   /Users/CurrentUser/Library/Application Support/eXpress or:
   ~/Library/Application Support/eXpress You can quickly navigate to the folder via Finder: Go > Go to Folder... If the folder doesn’t exist, search for the file eXpress-config.json and delete it. If needed, show hidden folders by pressing Shift + Cmd + ..

System Requirements for Linux

App Formats for Linux

Repositories for downloading Linux packages are not available.

Installation on Linux

Standard Installation

Certificate Installation on Linux

Install corporate server certificates to enable connectivity:

Language and Spellchecking on Linux

The interface language is determined by the OS settings. Available languages: Russian, English, French, German, Spanish, Arabic, Turkish, Indonesian. To change the language: Settings > General > Language.

The built-in spellchecker from the operating system (if available) is used for the current system language.

Credential Storage on Linux

Authentication data is stored in the gnome-keyring. To view the keys, open the keyring manager:

• Passwords and Keys in Ubuntu;
• KWallet in KDE;
• Seahorse and other keyring managers.

Keyring Password

On the first app launch, you’ll be prompted to create a keyring password (if it hasn’t been used before and no password was set). ⚠️ On subsequent app launches, the system may ask for this password again.

Deleting Keys

If you delete authentication keys from the keyring, the authentication screen will appear after restarting the app. Keys are preserved during standard app uninstallation.

Application-Specific Keystore

Beginning with version 3.42, the ETS custom apps support configuration of an independent keystore located in /home/user_name/.config/app_name directory. Contact eXpress support to get more details.

Updating on Linux

Automatic updates are available if enabled in settings (learn more).

Disabling Update Checks

Block access to the updates.express.ms resource (ETS app uses its own updates server, if configured).

Standard Update

In the app, if updates are available: Settings (avatar button) > Check for Updates.
Manual updates are performed as a standard installation.

Uninstallation on Linux

Standard Uninstallation

Complete App Uninstallation with Traces Removal on Linux

Required to resolve critical errors.

1. Uninstall the app using the standard method.
2. Open the keyring manager (Passwords and Keys in Ubuntu, KWallet in KDE, or Seahorse in Astra Linux).
3. Delete keys starting with eXpress.
4. Delete the folder:
   /home/username/.config/eXpress

The web app can be opened in any modern browser on a computer: corp.express.
Your organization may use a different address for the web app.

Browser Requirements for the Web App

Browsers

⚠️ The web app does not work in mobile browsers.

Required Permissions

Browser Extensions

It is recommended to disable ad blocker/VPN/proxy extensions or add the web app site to their exceptions.

Installing Certificates for the Web App

Installing non-standard corporate server certificates is required for the server connection to work. See the instructions for operating systems:

• Installing Certificates on Windows
• Installing Certificates on macOS
• Installing Certificates on Linux

Language and Spell Check in the Web App

The interface language is determined by the browser settings. Several languages are supported: Russian, English, French, German, Spanish, Arabic, Turkish, Indonesian. To change the language: Settings > Main settings > Language.

The built-in browser spell check is used.

Updating the Web App

Progressive Web App

The web app can be installed as a progressive web app (PWA) in Chromium-based browsers (Chrome, Yandex Browser, Opera, Vivaldi, etc.): open the web app and click the install button in the address bar.

Web App Widget

A widget that can be embedded on the organization's internal corporate portal. The description and code are available in the repository (in Russian).

What Does the Web App Widget Look Like?

When adding the script to a page, a button will appear in the lower right corner, opening a special eXpress window through which an employee can log in to eXpress and contact a colleague.

Guest Access Using Web App

The web app is used for guests to join chats (PC only), as well as calls and conferences (on both PC and mobile devices).

There is a Windows version that supports any authentication method, and an Outlook Web Access version (including macOS) which only supports Keycloak authentication.

Instructions and Distribution:

• Outlook Add-in Installation Instructions
• Distribution Package and General Information

Custom Branded Add-In Version

Customers using a branded ETS app can request a branded version of the add-in from their account manager or the eXpress project supervisor.

Add-In Language

How to Track Updates

New versions of client apps and the eXpress server are released regularly. You can track updates on the following resources:

• The “Updates” section on this website
• The #Express - Tech Notifications channel in the app (in Russian for corporate users only)
  
  If you are the first participant from a corporate server, previous channel messages will be unavailable. For details, see the “History and End-to-End Encryption” section.
• The VKontakte community (in Russian)
• The Telegram channel (in Russian)

Updates on Mobile Platforms

Updates are installed automatically when a new version is released in the app store.

Desktop App Updates

ETS App Updates

For branded ETS apps, the customer organization:

• Publishes updates in app stores
• Deploys app to workstations

Client Update Administration

Desktop App Update Algorithm

How automatic updates work:

1. The Auto update app setting is enabled, and there is access to updates.express.ms (ETS app uses its own updates server, if configured).
2. At startup, a timer (6–12 hours) is generated to check for updates. This prevents simultaneous requests from all users.
3. A /settings/server/meta request is sent to CTS or RTS:
   • If the request is successful — check again in 1–10 minutes.
   • If there’s an error — the check is canceled after 20 seconds.
4. When a new version is detected:

   Version	Installation Method
   X.x.x (Major)	A notification is displayed prompting to install.
   x.X.x (Minor)	A notification is displayed prompting to install.
   x.x.X (Patch)	Automatic installation upon restart without confirmation.

Configuring Automatic Updates for Desktop ETS App

Only for desktop app formats that support automatic updates:

1. Create a read-only bucket in a public S3 storage (recommended volume — 10 GB).
2. Place version files from eXpress developers with anonymous access.
3. Provide the bucket link to eXpress for integration into the ETS app build.

Web App Update

Updates for the eXpress web app are performed automatically by the provider itself. If your organization has deployed its own instance of the web app (eXpress or ETS app), the update is performed alongside the server software.

Tools to Motivate Users to Install Updates

There are built-in tools to encourage end users to install updates for client apps.

Server Software Updates

⚠️ For stable app performance, administrators are strongly advised to update server software regularly.

Key points:

• Server software updates are released simultaneously with or after client updates.
• Installation is performed by the organization’s system administrator, technical support, or eXpress implementation specialists.
• Server software lagging behind the client app by more than 3 versions may cause errors, and vice versa.

For detailed update installation instructions, see the administrator guide. If you have technical support — technical support contacts.

❓Related Topics:
• Keep Your App Updated
• UI Alerts (RTS and ETS)
• Update Notification
• Desktop App Does Not Search for Updates Despite a New Version Being Released
• Updating the Android App
• Updating the iOS and iPadOS App
• Updating the Aurora App
• Updating the Windows App
• Updating the macOS App
• Updating the Linux App
• Updating the Web App
• Updating Server Software

After Migrating the Android App to Another Device, It Doesn’t Work Correctly

It’s not recommended to migrate the app between devices using third-party data migration tools. If the app doesn’t work correctly after migration, reinstall it from the app store.

When Launching the Android App, the ROOTED DEVICE Error Appears

The app doesn’t support running on devices with ROOT permissions due to information security requirements. When attempting to launch on such a device, the Rooted Device error will appear with the reason:

Connection to the Server Doesn’t Work on Android 9 and Newer

Update the app to the latest version.

Two Copies of the App on a Windows Computer

Two copies may appear if the app is installed in Program Files and in the profile folder. To avoid this:

• For MSI packages of versions below 3.13, use the keys ISAUTOUPDATE="false" UPDATE="false" or place AppConfig.ini in %PROGRAMFILES%\App_Name.
• Before installing the MSI, remove the app from the profile using the command: "%LOCALAPPDATA%\Programs\App_Name\Uninstall App_Name.exe" /S.

If two copies already exist:

1. Uninstall one or both copies.
2. Reinstall the app via EXE or MSI.

The Windows App Freezes on the Logo Screen or Doesn’t Launch

.NET Framework 4.8 is required. After installation, restart your computer.

Check the integrity of system files:

1. Launch Command Prompt as administrator: “Start” > type cmd > right-click Command Prompt > Run as administrator.
2. Run: DISM.exe /Online /Cleanup-image /Restorehealth (may take up to an hour).
3. Then: sfc /scannow.

MSI Installation Problem: Windows Installer Error | 1613 Error in SCCM

Installation Repair

• Use the Microsoft diagnostic package.
• Manually: Control Panel > Programs and Features (or Settings > Apps > Installed apps) > select the app > Repair
• Via command line: msiexec /f "path_to.msi" (more information on the Microsoft website)

If the error persists, check the installation log.

Error When Removing the Previous Version of the App

If the MSI cache is corrupted (error The feature you are trying to use is on a network resource that is unavailable):

1. Download the problematic version of the MSI package from the eXpress | eXpress Corporate previous versions archive.
2. Create a BAT file to copy the MSI to the InstallSource folder and remove it (example below).
3. Disable the antivirus (if it corrupted the cache previously) and run the BAT file.

---

How to find the product code.

There is another method — delete the previous MSI installation entry from the Windows registry (proceed at your own risk!). Here's an example PowerShell script for eXpress:

“Cannot Open the Program” Error on macOS

Check:

• Compatibility of the app version with the processor (Intel/Apple Silicon).
• Permission to launch: System Preferences > Privacy & Security > Allow.

Or run in Terminal:

The Desktop App Doesn’t Search for Updates

Check:

• Whether automatic updates are enabled: Settings > General Settings > Automatically Update the App.
• Whether the update server is accessible.
• A delay in updates is possible (details).

If the issue persists, collect logs and contact support.

After Updating the App on macOS, the Old Version Launches

After launching the update, close the app via Dock or Cmd+Opt+Esc, then open it again.

The Linux App Freezes on the Logo Screen

Install the required libraries. See system requirements.

Desktop App Fails to Launch on Linux Due to Sandbox Error

If the app fails to launch and the terminal displays errors such as:

or

Solution: Launch the app with the --no-sandbox parameter.

“Cannot Satisfy Dependencies” Error When Installing DEB Package on Linux

The error may occur in the package installer (e.g., QApt Package Installer).

Solution: Install the package as superuser:

“GLIBC_2.25 Not Found” Error When Launching on Astra Linux 2.12

Astra Linux 2.12 uses an outdated version of GLIBC. We recommend updating the OS to the latest version. If updating is not possible, follow these steps:

1. Open the terminal.
2. Download and install GLIBC version 2.28: sudo mkdir /tmp/install_glibc/ cd /tmp/install_glibc/ sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc6_2.28-10+deb10u1_amd64.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/locales_2.28-10+deb10u1_all.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc-l10n_2.28-10+deb10u1_all.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc-bin_2.28-10+deb10u1_amd64.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc-dev-bin_2.28-10+deb10u1_amd64.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc6-dev_2.28-10+deb10u1_amd64.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc6-dbg_2.28-10+deb10u1_amd64.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc6-i386_2.28-10+deb10u1_amd64.deb sudo wget http://ftp.ru.debian.org/debian/pool/main/g/glibc/libc6-x32_2.28-10+deb10u1_amd64.deb sudo dpkg -i *.deb
3. Run the following commands to complete the installation: sudo dpkg -i *.deb apt-get -f install
4. In the dialog box, confirm the configuration update (select YES and press Y).
5. Restart the app.

File Drag-and-Drop Doesn’t Work and Session Terminates After Installation/Update on Windows

The issue occurs if the app is running as SYSTEM or another user different from the current one. As a result:

• The app cannot find credentials and cache because it looks for them in another user’s profile, leading to session termination.
• Windows Explorer cannot interact with the app running with elevated privileges, causing file drag-and-drop to fail.

Solution:

1. Close the app via the system tray.
2. Launch it again using the shortcut—this will restore proper permissions.

“Application Does Not Work on Jailbroken Devices” After App Store Installation

Installing the App From App Store on Apple Silicon Mac?

The eXpress mobile app doesn't support Apple processor Macs and therefore isn't available in the Mac App Store. If you found your ETS-branded app in the Mac App Store on an Apple processor Mac, contact your organization's support to remove it from there, then download and install the desktop app using the DMG file for Apple Silicon Macs.

Installing the App From App Store on Jailbroken iPhone/iPad?

The app doesn't work on jailbroken Apple mobile devices. Verify your device isn't compromised.

"App Unavailable" When Installing eXpress From App Store

eXpress is unavailable in China's App Store region, and while visible in US/Canada stores, the app cannot be installed there.

Verify your App Store profile's country settings:

1. Open the App Store app and tap your profile icon in the top-right corner.
2. Tap your name at the top.
3. Ensure Country/Region isn't set to China, US, or Canada.
4. If the error persists after changing regions, reboot your device to refresh App Store.