Sent you a two part email.
For anyone else that needs this. Regardless of if you play it on the original Xbox or the 360. Load the game like you're going to play it. At the main menu there should be an option for live content (or market place), if not there, try the sub-menus (been a while since I've had to do this). Click on it and it brings you to the market place. This download is not free and it costs money not ms points. Make sure you have a credit card. Also, good luck as their have been people that went to do this only to have it not appear their to purchase. If that happens, there's nothing you can do (but it is a rare occurrence though).
Unofficial Gamerparents Play Date/Meet & Greet Thread