We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
What you have to do is go into the zombies menu and all the way at the bottom below options will be the store. Click on that and the first thing that will pop up is the season pass which will have a check mark and say purchased. Go right on the left thumbstick
and it will move over to Nuketown Zombies. Hit 'A' and it will say the download is free, confirm purchase, go to the dashboard and let it download.