Finally works. But you need to correctly remove all old files first.

After installing this update, I got a service interruption notice saying "You have been disconneted from Apple Services, etc..." when trying to load facetime, restarting the macbook didnt help. So I used a great little app called "AppDelete" and it found all the old file from facetime, deleted them, and then I installed this new version again, it worked after that. It would be nice if Apple cared to mention this.

IggyNSerG about FaceTime