Hi all,
I have bought the season pass for Halo 4 and I can’t download the maps why is this?
Technical issues.
No one here will be able to tell you the correct answer. I suggest contacting XBL Support.
If you would have spent 15 seconds to read the forum before you posted, you would have learned that all you have to do is wait.
Please continue discussing this, here 
https://forums.halowaypoint.com/yaf_postst162632_Crimson-Map-Solution.aspx