I want to make profiles visible to guests and block only a membersgroup.
How is that possible?
Sure it's possible. There are the following permissions/CANs for this purpose:
- Can view members
- Can view profiles
In your case for"Guest" usergroup those permissions should be checked and unchecked from the other groups you want.
More info here: https://wpforo.com/docs/root/members/forum-members-users/
How can i block one members group not to be visible?