The listing, Earth 2150 - Lost Souls (Steam Key) has ended.
Earth 2150: Lost Souls is the second sequel to the real time strategy game Earth 2150. While the game is in fact a stand-alone game, many consider it the second expansion pack because it does little more than provide new missions, and weapons.
Activation Details
1. Follow the link: http://store.steampowered.com/ and download STEAM client.
#If you are a new Steam user, click the “Create a new account” button to register a new account.
2. Click "Install Steam" (from the upper right corner)
3. Install and start application, login with your login credentials
4. Click the Games Menu inside Steam client
5. Choose Activate a Product on Steam
6. Follow the onscreen instructions to complete the process.