Modern Call of Duty titles require persistent, dedicated online connections to official Activision servers to run. Legitimate copies cannot simply be zipped up into a .rar file and played.

The actual installation of Modern Warfare II demands well over 100 GB of storage space. If the .rar file you are looking at is only a few gigabytes or labeled as "highly compressed," it is fake.

Activision's official launcher handles automated security and file verification.

You can purchase and safely download the game on the Steam Store .