White screen (Assassin's Creed: Revelations)

Activated the key additions to the archive, if you upload a save of the main game appears endless white screen. Tried to find something myself, it was necessary to install patches, but patches are not installed. Just want to unlock the rest of the achievements because I'm such a perfectionist)) the Game passed by 100%, so needless to say, to begin anew, I want to avoid this.