I downloaded Darkest Hour (A Hearts of Iron Game) from the XBOX Live Marketplace. It is a PC game that is only available by download. However, you need a code for this game to register it to the Paradox Forums website. You need this code if you want technical help, or need to patch/upgrade your game. I never received a code and according to the Paradox Forums: "it's their responsibility to provide the Paradox forum registration code."
How do I attain this code?