$url="http://ocs.krainz-edv.at/OCS-NG-Windows-Agent-Setup.exe"
$outpath = "$ENV:TEMP/ocs.exe"

$wc = New-Object System.Net.WebClient
$wc.DownloadFile($url, $outpath)

$args = @("/S","/SERVER=http://ocs.krainz-edv.at/ocsinventory","/NO_SYSTRAY","/NOW")
Start-Process -Filepath "$ENV:TEMP/ocs.exe" -ArgumentList $args