Deactivated Windows Firewall + Antivir but sadly no luck. This is so weird.
Also tried other packages like Scenery Developer Pack, since I need that at the moment
Any other idea?
EDIT:
Just noticed, any failed installation of a module like DeveloperPack or Trees succeedes to create the specific folder but it is empty.
I have "SAM_DeveloperPack" and "SAM_GlobalTrees".