Reinstall New Teams for VDI

# Add Registry Keys
$regPath1 = "HKLM:\SOFTWARE\WOW6432Node\Citrix\WebSocketService"
$regPath2 = "HKLM:\SOFTWARE\Microsoft\Teams"
$regPath3 = "HKLM:\Software\Policies\Microsoft\Windows\Appx"
$processWhitelistKey = "ProcessWhitelist"
$teamsWVDKey = "IsWVDEnvironment"
$allowAllTrustedAppsKey = "AllowAllTrustedApps"

# Create the registry key for ProcessWhitelist if it doesn't exist and set the value
if (-not (Test-Path $regPath1)) {
    New-Item -Path $regPath1 -Force
}
Set-ItemProperty -Path $regPath1 -Name $processWhitelistKey -Value "msedgewebview2.exe" -Type MultiString

# Create the registry key for IsWVDEnvironment if it doesn't exist and set the value
if (-not (Test-Path $regPath2)) {
    New-Item -Path $regPath2 -Force
}
Set-ItemProperty -Path $regPath2 -Name $teamsWVDKey -Value 0 -Type DWord

# Create the registry key for AllowAllTrustedApps if it doesn't exist and set the value
if (-not (Test-Path $regPath3)) {
    New-Item -Path $regPath3 -Force
}
Set-ItemProperty -Path $regPath3 -Name $allowAllTrustedAppsKey -Value 1 -Type DWord

# Create the temp directory if it doesn't exist
$tempDir = "C:\temp\teams"
if (-not (Test-Path $tempDir)) {
    New-Item -Path $tempDir -ItemType Directory
}

# Download files
$files = @(
    @{url = "https://go.microsoft.com/fwlink/?linkid=2243204&clcid=0x409"; path = "$tempDir\teamsbootstrapper.exe"},
    @{url = "https://go.microsoft.com/fwlink/?linkid=2196106"; path = "$tempDir\MSTeams-x64.msix"}
)

$webClient = New-Object System.Net.WebClient

foreach ($file in $files) {
    try {
        $webClient.DownloadFile($file.url, $file.path)
        Write-Output "Successfully downloaded $($file.url)"
    } catch {
        Write-Error "Failed to download $($file.url): $_"
    }
}

# Clean up
$webClient.Dispose()

# Check if the files were downloaded successfully
if (-not (Test-Path "$tempDir\teamsbootstrapper.exe")) {
    Write-Error "Failed to download teamsbootstrapper.exe"
    exit 1
}

if (-not (Test-Path "$tempDir\MSTeams-x64.msix")) {
    Write-Error "Failed to download MSTeams-x64.msix"
    exit 1
}

# Uninstall Teams
& "$tempDir\teamsbootstrapper.exe" -x

# Install Teams
& "$tempDir\teamsbootstrapper.exe" -p -o "$tempDir\MSTeams-x64.msix"


If (-not ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] 'Administrator') ){
    Write-Error "Need to run as administrator. Exiting.."
    exit 1
}

# Get Version of currently installed new Teams Package
if (-not ($NewTeamsPackageVersion = (Get-AppxPackage -Name MSTeams).Version)) {
    Write-Host "New Teams Package not found. Please install new Teams from https://aka.ms/GetTeams ."
    exit 1
}
Write-Host "Found new Teams Version: $NewTeamsPackageVersion"

# Get Teams Meeting Addin Version
$TMAPath = "{0}\WINDOWSAPPS\MSTEAMS_{1}_X64__8WEKYB3D8BBWE\MICROSOFTTEAMSMEETINGADDININSTALLER.MSI" -f $env:programfiles,$NewTeamsPackageVersion
if (-not ($TMAVersion = (Get-AppLockerFileInformation -Path $TMAPath | Select-Object -ExpandProperty Publisher).BinaryVersion))
{
    Write-Host "Teams Meeting Addin not found in $TMAPath."
    exit 1
}
Write-Host "Found Teams Meeting Addin Version: $TMAVersion"

# Install parameters
$TargetDir = "{0}\Microsoft\TeamsMeetingAddin\{1}\" -f ${env:ProgramFiles(x86)},$TMAVersion
$params = '/i "{0}" TARGETDIR="{1}" /qn ALLUSERS=1' -f $TMAPath, $TargetDir

# Start the install process
write-host "executing msiexec.exe $params"
Start-Process msiexec.exe -ArgumentList $params
write-host "Please confirm install result in Windows Eventlog"