Locate your players/profiles folder in the CoD4 directory and copy your existing mpdata to a safe location.

The process typically involves running the tool alongside the game while in the multiplayer menu.

Choose your game version (most common is 1.7) and click "Easy Upgrade" .

Start the game and create a new profile if you don't want to overwrite your main one.

Most modern players use the , which fixes security vulnerabilities and allows access to updated server browsers. While EasyAccount was designed for the original v1.7, it can still work with CoD4x if you apply the upgrade to a v1.7 profile before connecting to CoD4x-specific servers. How to Install COD4x Mod for Call of Duty 4: Modern Warfare