Updating Microsoft Teams Rooms manually

Hello,

For the first time I am trying to update our Microsoft Teams Rooms VC units, and I am using the deployment package MSI. We have the Windows Store disabled in our organization.

I am using the PowerShell command that was included on a Microsoft support webpage, but it doesn't seem to work. 

Add-AppxPackage -Update -ForceApplicationShutdown -Path "$PSScriptRoot\*.appx" -DependencyPath (Get-ChildItem "$PSScriptRoot\Dependencies\x64\*.appx" | Foreach-Object {$_.FullName})

I get the following error:

Add-AppxPackage : Deployment failed with HRESULT: 0x80073D19, An error occurred because a user was logged off.
Windows cannot update package Microsoft.SkypeRoomSystem_4.0.85.0_x64__8wekyb3d8bbwe because the previous version is
not installed. Install package Microsoft.SkypeRoomSystem_4.0.85.0_x64__8wekyb3d8bbwe instead of updating it.
NOTE: For additional information, look for [ActivityId] 49d95327-2d18-0000-c4f3-d949182dd501 in the Event Log or use
the command line Get-AppxLog -ActivityID 49d95327-2d18-0000-c4f3-d949182dd501

But if I remove the -update parameter, then it works fine. But I still see the old and new version installed under C:\Program Files\WindowsApps\ so I am guessing that isn't right.

Can anyone provide some guidance to what might be wrong?

Thank you!