As you probably recall , because of problems with launch of Assassin's Creed: Unity Ubisoft had made future free DLC promising a free game to all those who had already bought the Season Pass of the title. The offer is now active: If you are entitled to free game you will have to then go to this page (it is possible that in these early hours having some problem in loading of players who try to access it), and then follow the on-screen instructions until you get to the choice of the game to get. The site will obviously if there is a Season Pass redeemed on your Xbox Live account .