unable to download Teams

What exactly is the OS version of your Windows 10 installation?

Be aware that the New Teams application requires Windows 10 version 10.0.19041 or higher (excluding Windows LTSC versions for Teams desktop app1).

https://dotnet.territoriali.olinfo.it/en-us/microsoftteams/teams-client-system-requirements

Hi! Let me help you with this issue.Please check whether you have any other Teams-related apps currently installed. If you have, please remove them and try the Teams installer again.

If the above steps didn't work, try installing Teams, then when you get to the error, click Open Setup log and paste it here. Thanks!

The most common reason Teams fails to download or install after a PC reset is a Windows policy or setting that blocks installing the new Teams app package.

Try these steps on the Windows PC:

1. Run the pre-installation check
   • Use the pre-installation check script described in Resolve the new Teams client installation issues to identify what is blocking the installation, and follow the script’s suggested fixes.
2. Check for restrictive Group Policy settings
   1. Open the Run dialog (Windows key + R), type gpedit.msc, and press Enter to open Local Group Policy Editor.
   2. Go to Computer Configuration > Administrative Templates > Windows Components > App package Deployment.
   3. Find these policies and make sure they are set to Not configured:
      • Prevent non-admin users from installing packaged Windows apps
      • Allow all trusted apps to install
   4. Apply changes and retry the Teams installation.
3. Check registry keys that can block Teams installation
   • Open Registry Editor and check these locations for the following values:
     • Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock
     • Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Appx
   • Keys that can block the new Teams MSIX installation:
     • BlockNonAdminUserInstall
     • AllowAllTrustedApps
     • AllowDevelopmentWithoutDevLicense
   • If AllowAllTrustedApps is set to 0 (disabled), the new Teams app installation fails on older Windows builds. Install the October or later cumulative update for the version of Windows 10/11 in use (KB5031445/KB5031455 or later), or the corresponding November security update, then try again.
4. If the PC is on Windows 11 version 21H1 SV1 (Build 10.0.22000)
   • That build remains blocked from installing the new Teams app when AllowAllTrustedApps is disabled. In this case, upgrade Windows 11 to a newer version, then retry the Teams installation.

After applying the above, download and install Teams again and it should complete successfully.

References:

• Resolve the new Teams client installation issues