you need to go to your storage and delete the map pack. to go to storage click on system settings. select the storage you used, click on black ops 2, then click on the dlc and delete. Now you should be able to redownload it if you already purchased it. If
you have season pass then go onto the store on the game and download the dlc. If you are trying to get free dlc this will not work, if you already purchased it you wouldn't have to repay for it
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