Upgrade your Spintires: MudRunner with the American Wilds Expansion and enjoy a slew of new additions, including 9 iconic US trucks from household brands like Ford, Hummer and Chevrolet, and dozens of new vehicles add-ons, 2 new sandbox maps inspired by the rough lands of Montana and North Dakota, and 2 new challenge maps!Overcome muddy terrain, raging rivers, and other obstacles that all realistically react to the weight and movement of your vehicle powered by the game's advanced physics engine. With your map, compass, winch, and your driving skills, go solo or join up to three others in the coop multiplayer.

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.