The Software License and Service Agreement will be updated. Please follow this link [https://www.activision.com/legal/ap-eula] in order to see these changes.
Whenever new content or updates are available, it is important to allow these packages to download completely before playing the game or accessing the new content. New content includes DLC packs, title updates, console updates, and compatibility packs. Attempting to play the game or access the content prior to completion of the download can cause errors that may require the uninstallation and reinstallation of some or all of the content.
Be sure to also verify that the DLC pack has fully downloaded.