To pre-install Warzone 2 & MW2 Season 3 update, you need to launch the Battle client and search for "Call of Duty: MWII | WZ 2.0". If the game is not in your Favorites bar, click on "All Games" to find it. You can locate Warzone 2.0 either in the Featured section or under the "Activision" tab on the left.
