The most reliable method is through Steam . You can purchase the "Call of Duty: Modern Warfare 3 Bundle," which often includes all four collections at a discount compared to buying them individually.
The DLC for Modern Warfare 3 was released in four major "Collections," which are still the primary way to acquire the extra content on PC: call-of-duty-modern-warfare-3-pc-game-all-dlcs-download
Having all DLCs installed will significantly increase the game's footprint, adding roughly 10-15 GB to the base installation. The most reliable method is through Steam
Once purchased, the DLC content is managed through the Steam Library. Right-click the game, select Properties , then DLC to ensure all packs are checked for download. Once purchased, the DLC content is managed through
On PC, the matchmaking system prioritizes players who have the same DLC configuration. If you have all DLCs enabled, you will primarily be matched with other DLC owners, which can sometimes lead to longer wait times in older titles.
Modern Warfare 3 on PC supports a dedicated server browser, where you can specifically filter for servers running DLC map rotations.
Includes three Multiplayer maps (Sanctuary, Foundation, Oasis), two Special Ops missions (Kill Switch, Iron Clad), and the debut of "Face Off" maps (Getaway, Lookout).