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Microsoft teams can't start

Anonymous
2021-03-04T00:52:58+00:00

Dear All,

Im having problems starting my teams app on my laptop, and decided to uninstall the app in hoping to reinstalling it again.

However, i just can't seem to reinstall the app. Below is the setup log prompted to me:

2019-05-28 10:09:46> Program: Starting Squirrel Updater: --install .

2019-05-28 10:09:46> Program: Starting install, writing to C:\Users\kamal-local\AppData\Local\SquirrelTemp

2019-05-28 10:09:46> Program: About to install to: C:\Users\kamal-local\AppData\Local\WhatsApp

2019-05-28 10:09:46> CheckForUpdateImpl: Couldn't write out staging user ID, this user probably shouldn't get beta anything: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\WhatsApp\packages.betaId'.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.StreamWriter.CreateFile(String path, Boolean append, Boolean checkHost)

   at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize, Boolean checkHost)

   at System.IO.File.InternalWriteAllText(String path, String contents, Encoding encoding, Boolean checkHost)

   at System.IO.File.WriteAllText(String path, String contents, Encoding encoding)

   at Squirrel.UpdateManager.CheckForUpdateImpl.getOrCreateStagedUserId()

2019-05-28 10:09:46> CheckForUpdateImpl: Failed to load local releases, starting from scratch: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\WhatsApp\packages\RELEASES'.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)

   at Squirrel.Utility.LoadLocalReleases(String localReleaseFile)

   at Squirrel.UpdateManager.CheckForUpdateImpl.<CheckForUpdate>d__2.MoveNext()

2019-05-28 10:09:46> CheckForUpdateImpl: Reading RELEASES file from C:\Users\kamal-local\AppData\Local\SquirrelTemp

2019-05-28 10:09:46> CheckForUpdateImpl: First run or local directory is corrupt, starting from scratch

2019-05-28 10:09:47> Unhandled exception: System.AggregateException: One or more errors occurred. ---> System.IO.IOException: The process cannot access the file 'C:\Users\kamal-local\AppData\Local\SquirrelTemp\WhatsApp-0.3.2848-full.nupkg' because it is being used by another process.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)

   at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite)

   at Squirrel.UpdateManager.DownloadReleasesImpl.<>c__DisplayClass2_0.<DownloadReleases>b__3(ReleaseEntry x)

   at Squirrel.Utility.<>c__DisplayClass12_1`1.<ForEachAsync>b__1()

   at System.Threading.Tasks.Task.InnerInvoke()

   at System.Threading.Tasks.Task.Execute()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.Utility.<>c__DisplayClass13_0`1.<<ForEachAsync>b__1>d.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.UpdateManager.DownloadReleasesImpl.<DownloadReleases>d__2.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.UpdateManager.<DownloadReleases>d__8.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.UpdateManager.<FullInstall>d__10.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)

   at Squirrel.Update.Program.<Install>d__4.MoveNext()

   --- End of inner exception stack trace ---

   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)

   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)

   at System.Threading.Tasks.Task.Wait()

   at Squirrel.Update.Program.executeCommandLine(String[] args)

   at Squirrel.Update.Program.main(String[] args)

---> (Inner Exception #0) System.IO.IOException: The process cannot access the file 'C:\Users\kamal-local\AppData\Local\SquirrelTemp\WhatsApp-0.3.2848-full.nupkg' because it is being used by another process.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)

   at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite)

   at Squirrel.UpdateManager.DownloadReleasesImpl.<>c__DisplayClass2_0.<DownloadReleases>b__3(ReleaseEntry x)

   at Squirrel.Utility.<>c__DisplayClass12_1`1.<ForEachAsync>b__1()

   at System.Threading.Tasks.Task.InnerInvoke()

   at System.Threading.Tasks.Task.Execute()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.Utility.<>c__DisplayClass13_0`1.<<ForEachAsync>b__1>d.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.UpdateManager.DownloadReleasesImpl.<DownloadReleases>d__2.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.UpdateManager.<DownloadReleases>d__8.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at Squirrel.UpdateManager.<FullInstall>d__10.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)

   at Squirrel.Update.Program.<Install>d__4.MoveNext()<---

2019-05-28 10:09:50> Program: Starting Squirrel Updater: --install .

2019-05-28 10:09:50> Program: Starting install, writing to C:\Users\kamal-local\AppData\Local\SquirrelTemp

2019-05-28 10:09:50> Program: About to install to: C:\Users\kamal-local\AppData\Local\WhatsApp

2019-05-28 10:09:50> Program: Install path C:\Users\kamal-local\AppData\Local\WhatsApp already exists, burning it to the ground

2019-05-28 10:09:51> CheckForUpdateImpl: Couldn't write out staging user ID, this user probably shouldn't get beta anything: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\WhatsApp\packages.betaId'.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.StreamWriter.CreateFile(String path, Boolean append, Boolean checkHost)

   at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize, Boolean checkHost)

   at System.IO.File.InternalWriteAllText(String path, String contents, Encoding encoding, Boolean checkHost)

   at System.IO.File.WriteAllText(String path, String contents, Encoding encoding)

   at Squirrel.UpdateManager.CheckForUpdateImpl.getOrCreateStagedUserId()

2019-05-28 10:09:51> CheckForUpdateImpl: Failed to load local releases, starting from scratch: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\WhatsApp\packages\RELEASES'.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)

   at Squirrel.Utility.LoadLocalReleases(String localReleaseFile)

   at Squirrel.UpdateManager.CheckForUpdateImpl.<CheckForUpdate>d__2.MoveNext()

2019-05-28 10:09:51> CheckForUpdateImpl: Reading RELEASES file from C:\Users\kamal-local\AppData\Local\SquirrelTemp

2019-05-28 10:09:51> CheckForUpdateImpl: First run or local directory is corrupt, starting from scratch

2019-05-28 10:09:57> ApplyReleasesImpl: Writing files to app directory: C:\Users\kamal-local\AppData\Local\WhatsApp\app-0.3.2848

2019-05-28 10:10:30> LogHost: Rigging execution stub for WhatsApp_ExecutionStub.exe to C:\Users\kamal-local\AppData\Local\WhatsApp\WhatsApp.exe

2019-05-28 10:10:40> ApplyReleasesImpl: Squirrel Enabled Apps: [C:\Users\kamal-local\AppData\Local\WhatsApp\app-0.3.2848\WhatsApp.exe]

2019-05-28 10:10:58> ApplyReleasesImpl: Starting fixPinnedExecutables

2019-05-28 10:10:58> ApplyReleasesImpl: Fixing up tray icons

2019-05-28 10:10:59> ApplyReleasesImpl: cleanDeadVersions: for version 0.3.2848

2019-05-28 10:10:59> ApplyReleasesImpl: cleanDeadVersions: exclude folder app-0.3.2848

2020-05-14 17:25:39> Program: Starting Squirrel Updater: --install . --exeName=Teams_windows_x64 (1).exe

2020-05-14 17:25:40> Program: setup.json does not exist

2020-05-14 17:25:40> Program: Starting install, writing to C:\Users\kamal-local\AppData\Local\SquirrelTemp

2020-05-14 17:25:40> Program: File does not contain contextual info: Teams_windows_x64

2020-05-14 17:25:40> UpdateManager: using rootAppDirectory: C:\Users\kamal-local\AppData\Local\Microsoft\Teams

2020-05-14 17:25:40> Program: About to install to: C:\Users\kamal-local\AppData\Local\Microsoft\Teams

2020-05-14 17:25:40> Program: Setup.json exist, copying over

2020-05-14 17:25:40> RegistryService: RegKeyExists: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run does not have TeamsMachineInstaller

2020-05-14 17:25:40> Program: CheckMsiAndTryAddInstallSource: Not MSI, no need to add HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\InstallSource

2020-05-14 17:25:40> CheckForUpdateImpl: Couldn't write out staging user ID, this user probably shouldn't get beta anything: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\Microsoft\Teams\packages.betaId'.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.StreamWriter.CreateFile(String path, Boolean append, Boolean checkHost)

   at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize, Boolean checkHost)

   at System.IO.File.InternalWriteAllText(String path, String contents, Encoding encoding, Boolean checkHost)

   at System.IO.File.WriteAllText(String path, String contents, Encoding encoding)

   at Squirrel.UpdateManager.CheckForUpdateImpl.getOrCreateStagedUserId()

2020-05-14 17:25:40> CheckForUpdateImpl: Failed to load local releases, starting from scratch: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\Microsoft\Teams\packages\RELEASES'.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)

   at Squirrel.Utility.LoadLocalReleases(String localReleaseFile)

   at Squirrel.UpdateManager.CheckForUpdateImpl.<CheckForUpdate>d__2.MoveNext()

2020-05-14 17:25:40> CheckForUpdateImpl: Reading RELEASES file from C:\Users\kamal-local\AppData\Local\SquirrelTemp

2020-05-14 17:25:40> CheckForUpdateImpl: First run or local directory is corrupt, starting from scratch

2020-05-14 17:25:40> ApplyReleasesImpl: No delta packages found. Applying current release package.

2020-05-14 17:25:40> ApplyReleasesImpl: getting squirrel aware apps failed with exception Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\Microsoft\Teams\current'.

2020-05-14 17:25:40> ApplyReleasesImpl: Writing files to app directory: C:\Users\kamal-local\AppData\Local\Microsoft\Teams\current

2020-05-14 17:25:50> ApplyReleasesImpl: Squirrel Enabled Apps: [C:\Users\kamal-local\AppData\Local\Microsoft\Teams\current\Teams.exe]

2020-05-14 17:26:02> ApplyReleasesImpl: About to RemoveOldShorcuts for Teams.exe, rootAppDir C:\Users\kamal-local\AppData\Local\Microsoft\Teams

2020-05-14 17:26:02> RegistryService: TryGetRegKey: HKEY_CURRENT_USER\Software\Policies\Microsoft\Cloud\Office\16.0\Teams does not exist

2020-05-14 17:26:02> ApplyReleasesImpl: Registry value Software\Policies\Microsoft\Cloud\Office\16.0\Teams\PreventFirstLaunchAfterInstall is not set

2020-05-14 17:26:02> RegistryService: TryGetRegKey: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Teams does not exist

2020-05-14 17:26:02> ApplyReleasesImpl: Registry value Software\Policies\Microsoft\Office\16.0\Teams\PreventFirstLaunchAfterInstall is not set

2020-05-14 17:26:02> RegistryService: TryGetRegKey: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Teams does not exist

2020-05-14 17:26:02> ApplyReleasesImpl: Registry value Software\Microsoft\Office\16.0\Teams\PreventFirstLaunchAfterInstall is not set

2020-05-14 17:26:02> ApplyReleasesImpl: Registry flags are not set: proceed with default value False

2020-05-14 17:26:02> ApplyReleasesImpl: Starting fixPinnedExecutables

2020-05-14 17:26:02> ApplyReleasesImpl: Fixing up tray icons

2020-05-14 17:26:02> MeetingAddinInstaller: System.ArgumentException: Cannot delete a subkey tree because the subkey does not exist.

   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)

   at Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String subkey, Boolean throwOnMissingSubKey)

   at Microsoft.Win32.RegistryKey.DeleteSubKeyTree(String subkey)

   at Squirrel.MeetingAddinInstaller.<InstallMeetingAddinAsync>d__15.MoveNext()

2020-05-14 17:26:02> MeetingAddinInstaller: StagedAppDirectory does not exist. Using Current

2020-05-14 17:26:02> MeetingAddinInstaller: There is no version.txt. Falling back to getting version from folder name

2020-05-14 17:26:02> MeetingAddinInstaller: Version: 1.0.20031.2; addinPackageDirectory: 1.0.20031.2

2020-05-14 17:26:02> MeetingAddinInstaller: .dead exists: False

2020-05-14 17:26:02> MeetingAddinInstaller: path to .dead: C:\Users\kamal-local\AppData\Local\Microsoft\TeamsMeetingAddin\1.0.20031.2.dead

2020-05-14 17:26:02> MeetingAddinInstaller: before cleanup unused versions

2020-05-14 17:26:03> MeetingAddinInstaller: Addin directory exists. Copy was successful

2020-05-14 17:26:04> MeetingAddinInstaller: Version 1.0.20031.2 of the meeting add-in is now installed

2020-05-14 17:26:04> PresenceAddinInstaller: Installing Teams Presence addin for Outlook...

2020-05-14 17:26:04> PresenceAddinInstaller: Copying C:\Users\kamal-local\AppData\Local\Microsoft\Teams\current\resources\assets\tlb\Uc.tlb to C:\Users\kamal-local\AppData\Local\Microsoft\TeamsPresenceAddin

2020-05-14 17:26:04> PresenceAddinInstaller: Copying C:\Users\kamal-local\AppData\Local\Microsoft\Teams\current\resources\assets\tlb\Uc.win32.tlb to C:\Users\kamal-local\AppData\Local\Microsoft\TeamsPresenceAddin

2020-05-14 17:26:04> PresenceAddinInstaller: check if UC TypeLib points to current\resources\assets\tlb\Uc.tlb

2020-05-14 17:26:04> PresenceAddinInstaller: Registering UC Typelib WIN32 under HKCU...

2020-05-14 17:26:07> PresenceAddinInstaller: UC Typelib WIN32 successfully registered to C:\Users\kamal-local\AppData\Local\Microsoft\TeamsPresenceAddin\Uc.win32.tlb under HKCU!

2020-05-14 17:26:07> PresenceAddinInstaller: UC Typelib WIN64 is registered under HKLM and file exists. Registration not needed!

2020-05-14 17:26:07> ApplyReleasesImpl: cleanDeadVersions: for version 1.3.00.12058

2020-05-14 17:26:07> ApplyReleasesImpl: cleanDeadVersions: exclude folder stage

2020-05-14 17:26:10> RegistryService: TryDeleteRegKey: HKEY_CURRENT_USER\Software\Microsoft\Office\Teams not found

Hope somebody can help me on this.

Thank You

Microsoft Teams | Microsoft Teams for business | Other

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  1. Anonymous
    2021-03-04T13:32:46+00:00

    Hello, Kamal

    The staging message points that user's LocalAppData folder can't be written to, which seems why that Squirrel fails

    2020-05-14 17:25:40> Program: CheckMsiAndTryAddInstallSource: Not MSI, no need to add HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\InstallSource

2020-05-14 17:25:40> CheckForUpdateImpl: Couldn't write out staging user ID, this user probably shouldn't get beta anything: System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\kamal-local\AppData\Local\Microsoft\Teams\packages\.betaId'.
    • By default, all users should have the ability to install the Teams app as it goes to your c:\users&lt;username>\ etc so I'm wondering if you have the rights to install.
    • What happen if you launch cmd as admin and run the installation, does it install?
    • Are you able to install it using another user profile?
    • May I know if you have an Antivirus running? If so, please disable that before proceed with Teams installation.

    There is some know issues with MC Affe preventing the software installation.

    • After disable AV proceed delete entirelly %LocalAppData%\Microsoft\Teams %LocalAppData%\Microsoft\TeamsMeetingsAddin %AppData%\Microsoft\Teams %LocalAppData%\SquirrelTemp
    • If nothing works, finally, you can try to proceed with a clean boot, it will start only Microsoft services and components during the Windows start and no third party will start with, so you can try to isolate better if some third party components is preventing this installation:

    https://support.microsoft.com/en-us/help/929135...

    Let me know how it goes.

    Best Regards

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  2. Anonymous
    2021-03-04T07:55:59+00:00

    Hi Igor,

    Thank you for responding to the post, appreciate it! I tried all the steps you stated, still i cant be able to do a fresh install of the teams application.

    Is there any other way to go about this that i may try?

    Thank You again

    Greetings from Malaysia

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  3. Anonymous
    2021-03-04T01:33:28+00:00

    Hello, Kamal

    I am Igor, an Independent Advisor and I will be glad to help you.

    Please follow steps below:

    Delete the folder C:\Users\username\AppData\Local\Microsoft\Teams

    Delete entire content from C:\Users\your name\AppData\Local\SquirrelTemp\

    Then open regedit (press windows key +r) and type regedit

    Navigate to the following reg key:

    HKEY_CURRENT_USER\Software\Microsoft\Office\Teams

    Delete the "PreventInstallationFromMsi" key

    Then download the latest version and try installing again from https://teams.microsoft.com/download

    Let me know how it goes.

    Best Regards

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