PLEASE HELP!!! Walking Dead 400 Days DLC wont download!!!

edited July 2013 in Game Support
I recently bought Season 1 through retail at Bestbuy. I finished and I bought 400 Days moments ago through the Gamestop App since I couldn't on Steam since it says I needed the original game to be on Steam and no one gave me the Product Code to link it with Steam. Gamestop told me I didn't have to worry about the Product Code issue and the DLC would download straight to the game. But AFTER I bought the DLC it tells me I need to link the DLC with Steam in order for it to download. It gave me the P-code for the DLC but it doesn't do any good since I need the original game on Steam as well and I have no P-code for the original. SOMEONE PLEASE HELP ME OUT HERE!!PLEASE PLEASE PLEASE!! I DONT KNOW WHAT TO DO HERE!:(:mad::(:mad:
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