Added new function for overwriting detectionRules on existing app.

[henrili]

By copying parts of code from Add-IntuneWin32App and Set-IntuneWin32App and merging into the Set-IntuneWin32AppDetectionRule, it is now possible to overwrite the ruleset on existing apps.

This is useful for automating update of existing apps. Example usage in custom script after downloading latest installer and generating intunewin file.

Connect-MSIntuneGraph -TenantID $tenantName -ClientID $scriptClientID -ClientSecret $scriptClientSecret

$appObject = Get-IntuneWin32App -ID $intuneAppId
if($null -eq $appObject){
    Write-Error "No app with given ID found. $intuneAppId"
    exit 1
}
Update-IntuneWin32AppPackageFile -ID $intuneAppId -FilePath $intuneWinFile
Set-IntuneWin32App -ID $intuneAppId -AppVersion $newVersion

$newRule = new-IntuneWin32AppDetectionRuleMSI -ProductCode $productCode -ProductVersionOperator greaterThanOrEqual "$newVersion"
Set-IntuneWin32AppDetectionRule -ID $intuneAppId -DetectionRule $newRule

[CWWallin]

Been looking for this as well. I added DetectionRule in Set-IntuneWin32App, but I think your way is a better way to go. Would love to see this merged.