Use the blue drop-down menu above the install button to select the correct version (look for the "Free Trial" text if an event is active).

Several methods are employed by individuals looking to download CoD MW3 PC for free. These include:

is the official free-to-play battle royale. It uses the same engine and mechanics as MW3.

Activision frequently hosts "Free Access" events, often during new season launches. These trials typically allow you to play selected Multiplayer maps and the Zombies mode for a limited time (usually 3–5 days).

Programs that lock your personal files and demand payment to unlock them.

While not strictly free, Microsoft includes Call of Duty titles on its Xbox Game Pass subscription service. If you are a new subscriber, you can often secure your first month for a heavily discounted trial price (such as $1). This grants you full access to the official, secure version of the MW3 Campaign, Multiplayer, and Zombies modes on your PC through the Xbox App. Modern Warfare 3 PC System Requirements