CoD Map Pack HELP

[i iZ Rogue]

So my friend and I both purchased one of the two CoD:MW2 map packs. Our plan was to only buy one and then trade accounts and download the other. So we traded accounts, downloaded the map pack. It's on my hard drive but when I go to play the maps on xbox live, it doesn't work. How can I get this to work?

 

[iiTz MaGiiCx]

you have to do the license transfer from xbox.com