I don't know how to download the Castle map pack DLC via Halo 4. I can find the download on the marketplace, but I have the season pass, which does not apply to the Xbox's marketplace. Halo 4 only prompts me that I don't have the newest DLC, Champion, which is sadly not part of the season pass -.- but I digress. Can someone tell me how to get get this DLC? I have also looked through Halo 4's marketplace on the home screen, but the only "Free" item is spartan ops episodes 6-10, and I do not see Castle anywhere.