in order to use the dl content from somebody elses xbox, you need to have the modified .xbe<< that is modified when you download the updates. Without it, when you restart the game it will be unable to verify downloaded content, and therefore will not install.
I have 2 xboxes and I basically took the downloaded content from one xbox to pc then to other xbox and it wont work. So i have the modified .xbe file and all the stuff that came with the download. Can you tell me why it doesn't work?