DLC Issues?

Alright so about a year ago, I purchased all of the Fallout 3 DLCs, completed them and everything. Just recently I re-downloaded broken steel because I got the new 360 slim, and don't have my old hard drive and saves, and wanted to continue after the project purity scene.

My question is, why can't I play the DLC without being connected to the internet? I don't recall having this problem before. It's the same profile which I downloaded the DLC's on in the first place, just a new xbox. I've read online some people having the same problem.

Some people say it's because they transferred Xbox's, and it only makes you do that if you're on another Xbox than what you originally downloaded it on, but It's the same profile, that shouldn't matter.

So basically, is this the real reason I have to be connected to the internet? Currently, that's pretty much a big hassle for me. Also, is there anything I can do to get around this problem? Thanks in advance.