Language Specific Code (function Test-WinGetApp)

[theITcloudAdmn]

If working on WinSystemLocale not US/EN, this is not going to work:
if ($line -like "*No installed package found*") {
https://github.com/byteben/MEM/blob/e85ebf4181d913701c27a67d22dfaf5790dc4381/Reset-Appx.ps1#L664C35-L664C61

For example in german it says:

Es wurde kein installiertes Paket gefunden, das den Eingabekriterien entspricht.

Maybe a better idea is to work with the exit code of
$winGetTest = & .\$winGetBinary list --id $winGetAppId --source $winGetAppSource --accept-source-agreements
(if this fails, $LASTEXITCODE is -1978335212)

For example:

Set-Location $winGetPath
& .\$winGetBinary list --id $winGetAppId --source $winGetAppSource --accept-source-agreements

if ($LASTEXITCODE -eq "0") {
   Write-Host "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is installed"
   Write-LogEntry -logEntry "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is installed" -logID $logID
   return @{Result = 'Installed' }
}
else {
   Write-Host "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is not installed"
   Write-LogEntry -logEntry "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is not installed" -logID $logID
   return @{Result = 'Not Installed' }
}

[theITcloudAdmn]

Just had a test case where $LASTEXITCODE was "0" but output was empty. So this is probably the safer way to do it:

Set-Location $winGetPath
& .\$winGetBinary list --id $winGetAppId --source $winGetAppSource --accept-source-agreements | Tee-Object -Variable winGetTest
$winGetTestFind = $winGetTest | Select-String -Pattern $winGetAppName

if (($LASTEXITCODE -eq "0") -and (-not([string]::IsNullOrEmpty($winGetTestFind)))) {
   Write-Host "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is installed"
   Write-LogEntry -logEntry "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is installed" -logID $logID
   return @{Result = 'Installed' }
}
else {
   Write-Host "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is not installed"
   Write-LogEntry -logEntry "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is not installed" -logID $logID
   return @{Result = 'Not Installed' }
}

Or without checking exit code:

$winGetTest = & .\$winGetBinary list --id $winGetAppId --source $winGetAppSource --accept-source-agreements

if ($winGetTest -like "*$winGetAppName*") {
   Write-Host "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is installed"
   Write-LogEntry -logEntry "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is installed" -logID $logID
   return @{Result = 'Installed' }
}
else {
   Write-Host "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is not installed"
   Write-LogEntry -logEntry "The 'WinGet list' command line indicated the '$($winGetAppName)' app, with Id '$($winGetAppId)', is not installed" -logID $logID
   return @{Result = 'Not Installed' }
}

[NorbertBauer]

I also have a similar error, but when checking/running the "winget.exe list --id ........." command manually, I get an error like "The source requires current machine's geographic region (like "US") to be sent to function properly." (translated from german).
I cannot figure out, if and how a I can set a region.