map pack

I downloaded all the map packs and I still can’t play !? Please help me

This happened to me in halo 4. I ended up having to go to the right where it said “system” on the dashboard & I went to the games part of the “system” icon, I then looked for the games that had the map packs & when I saw the map packs I was able to re-download them. I think I might have a step off & I apologize if that is the case.