Collectible Card Game Headquarters

Excuse me, I have dotp 2014 for xbox
Now I'm looking for the previous versions but I can't find them
Could someone tell me where I could download the torrent (or other ways) for the previous games?

I have already found them
Now I have doubts about the "unlocking" of this XBLA (xbox live arcade) files: I heard somewhere that there are ways to unlock the complete game, why, the game is not complete? What is locked? Where I can find and how I can install the DLCs?