If you own the Steam version of the NON-GOTY editions, you may want to go take a peak at Steam. You'll now notice that you also own the GOTY edition! IF you own the retail discs, then soon you should be able to enter your keys to redeem a Steam version. What's going on here? Well, since Microsoft killed "Games For Windows Live", you no longer can purchase DLC for your games. Soon, you will not be able to register your game either if you decide to reinstall. Not sure if this was WB Games or Steam's idea, but it will allow you to keep playing and downloading your game. FYI: Non Steam keys do not seem to be working yet. UPDATE: My retail keys worked as of a few days ago! Read everything you need to know after the jump