What security settings do you have?
What antivirus?
What firewall?
If you have settings that filter internet or downloads over internet in your antivirus, can you turn those off temporarily?
It's hard for us to know what to do unless we know what type of setup you have. Instructions for different antivirus may be different.
If you can't speak German, you might be able to navigate the
***Gamer Unlimited website*** using a translator like
***Google translator*** and look for their support section.
See if this direct link to their help works:
***support***