Buckle up, soldier! Welcome to Aliens™: Colonial Marines. Created by Gearbox, the critically acclaimed and fan-favorite developers of Borderlands and Brothers In Arms, you and your friends will become the most badass military outfit in the galaxy – the US Colonial Marines. It’s up to you to not just survive, but wipe out the Xeno infestation. 1. Go to: http://store.steampowered.com/ and download STEAM client.
2. Click “Install Steam” (from the upper right corner)
3. Install and start application, login with your Account name and Password (create one if you don’t have).
4. 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.