We are aware of an issue that is affecting some Xbox 360 players when they download the "Claptastic Voyage" DLC.
After downloading the content (split over two packages) to their consoles, some users have reported receiving a message stating the DLC is "not installed" in the game.
We are currently working on a fix for this issue, but you can use the following workaround in the meantime:
- Delete part one of the DLC only.
- Re-download part one again.
- After downloading part one again, you'll need to accept to install part one.