Some reason modernwarfare 2 diddent come with all the add-ons I need for multiplayer?

I have 2 xboxes, 1 I play at my main home and my other one is at my second home, I play mw2 on my main one all the time, I decided to gsme share on the same account to my secondary xbox and downloaded mw2. Well it says I need to purchase to play?

:)