Advanced Warfare Cant Access Exo Zombies Mode in Havoc DLC, see Fix
We have determined that players who are unable to play Exo Zombies are attempting to play before allowing the compatibility pack to fully download.
If your Xbox console requires a compatibility pack to be downloaded, you will receive the following message when you try starting an online game:
New required content has been added to your Active Downloads. This content is free and required to play online.
Please be sure to exit the game and allow all content to download before attempting to play the game.
To check Active Downloads on Xbox One:
Select My games and apps from the dashboard.
Select Queue.
To check Active Downloads on Xbox 360:
Press the Guide button in the dashboard.
Select Games & Apps.
Select Active Downloads.
Activision has received reports that some players who have downloaded and installed the Havoc DLC pack are being given an error stating A downloadable content package was removed or all profiles are signed out.