Sorry for my еnglish, I'm from Russia :)
We have the same problems with my friends. Firts time "installing" appears 6 Dec.
Of course, we can wait these half an hour. But! This process freezes the computer of the one who invites friends to the game! And only a computer restart can help, which means that you have to send invitations one more time and wait for the "installing" again and again. It's a vicious circle. We spent three hours today trying to start the game. I'm done.
