Tried everything from here:
and after I'm done downloading a game, as soon as it finishes downloading it will say it "can't download this item". I'm trying to download Halo:Reach. I transferred my license over to my new Xbox 360 and I can pretty much download all of my content except Reach. I've tried restarting my console and re-downloading numerous times, I've cleared the cache and deleted the "Unknown Game"s. I don't see what the problem is my internet connection is fine and I pretty much don't do anything while my console is downloading content. I just start the download and wait.
Can somebody please help me? This is really frustrating.