Jagged Alliance: Crossfire is a stand-alone expansion to the hit tactical RPG – Jagged Alliance: Back in Action. Crossfire adds new mercenaries, new environments and new weapons to challenge the player’s battlefield planning skills, while offering the combination of humorous dialog and realistic combat fans have come to expect from the series’ decade-long history.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.