Immediate Fix: Clear the Teams Cache
The most common reason for Microsoft Teams getting stuck at 100% is a corrupted local cache file that prevents the installer from finalizing the “handshake” between the downloaded data and the application directory.
To fix this immediately, you need to force-close the application and wipe the temporary update files. Follow these steps:
| Step | Action | Command/Location |
|---|---|---|
| 1 | Kill Teams Process | Task Manager (Ctrl+Shift+Esc) > End Task |
| 2 | Open Run Dialog | Press Windows Key + R |
| 3 | Navigate to Cache | %appdata%\Microsoft\Teams |
| 4 | Clear Files | Delete everything in the folder |
Alternatively, you can use the command line to quickly clear the update path and restart the process. Run the following command in PowerShell:
Get-ChildItem -Path "$env:AppData\Microsoft\Teams" -Recurse | Remove-Item -Force -RecurseTechnical Explanation: Why the Hang Occurs
When the progress bar reaches 100%, the download phase is complete. At this stage, Teams attempts to replace the existing executable (Teams.exe) with the newly downloaded version in the %LocalAppData% directory.
A “stuck” state usually indicates a file lock. This happens when a background process or a browser integration is still using a component of the old Teams version, preventing the installer from overwriting the file.
Network timeouts during the final checksum verification can also cause this. If the installer cannot verify the integrity of the 100% downloaded package, it will hang indefinitely rather than throwing an error code.
Alternative Methods to Force the Update
1. Use the New Teams Bootstrapper
If the standard update fails, you can force the transition to the “New Teams” client using the official Microsoft bootstrapper. This bypasses the old update loop entirely.
.\teamsbootstrapper.exe -p2. Check for “Squirrel” Setup Logs
Teams uses the Squirrel framework for updates. Check the SquirrelSetup.log file located in your %LocalAppData%\Microsoft\Teams folder. Look for “Access Denied” errors, which point to antivirus software blocking the final installation step.
3. Update via Web App
If you are in a rush, sign in to the Teams Web App (teams.microsoft.com). This often triggers a background sync with your desktop client profile, which can resolve configuration mismatches once you restart the desktop app.