[Kazun]

Код:

$msi = New-Object -ComObject WindowsInstaller.Installer
$savelist = @()
$products = $msi.GetType().InvokeMember("Products","GetProperty",$null,$msi,$null)
foreach($product in $products)
{
	$patches = $msi.GetType().InvokeMember("Patches","GetProperty",$null,$msi,@($product))
	foreach($patch in $patches)
	{
		$location = $msi.GetType().InvokeMember("PatchInfo","GetProperty",$null,$msi,@($patch,"LocalPackage"))
		$savelist += [pscustomobject]@{
			ProductCode = $product
			PatchCode = $patch
			PatchLocation = $location
		}
	}
}

$filelocation = $savelist | select -ExpandProperty PatchLocation

#First pass to remove exact file names
dir C:\windows\Installer -file | ForEach-Object{
    $fullname = $_.FullName
    if($filelocation | Where-Object{$_ -like "*$fullname*"}){
        "Keeping $fullname"
    }
    else{
        Remove-Item $fullname -Force -Verbose
    }
}

#second pass to match product and patch codes
dir C:\windows\Installer -Directory | ForEach-Object{
    $fullname = $_.name
    if($savelist | Where-Object{$_.ProductCode -like "*$fullname*" -or $_.PatchCode -like "*$fullname*" }){
        "Keeping $fullname"
    }
    else{
        Remove-Item $_.fullname -Force -Verbose -Recurse
    }
}