Unpack the included rar file into your Ghost Recon Advanced Warfighter 2 directory, accept to overwrite if asked.

1. Start game.
2. Choose Unleashed profile if it not automaticially choosen.
3. Click on Campaign
4. Pick any mission you want to play.
5. Play!

This will unlock all 10 missions in the campaign mode.

Download Ghost Recon Advanced Warfighter 2 [unlocker]