@george1421 yes after i tried so much things i remembered that fog runs the batch as SYSTEM. So i think that will be the problem because the Installer copies Files into the Users Folder. I will try your another suggestion with the mapped drive.
@Sebastian-Roth I tried to get a silent command for the installer and tried the standard lines like /verysilent , /silent , /s, /quiet , /q. And yeah it actually worked only with /s :-D