The expansion takes its artistic liberty further by setting the background in the Vietnam War and fighting Vietcong-themed enemies (Vietcong Goblins, for instance) with weapons in that era (e.g. AK-47). Players also have access to a new napalm magick, which takes the form of an airstrike.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.