How to activate full version of a game?

1. Order the game and make the payment. You'll receive an email with your activation code.
2. Download and install the game on your computer, if you haven't yet.
3. Start the game, you should see a screen like this:
   
   Don't see this screen? Then you probably have an old demo installed (released before October 22, 2009). Please download and install the most up to date version.
   
4. Just start typing in your activation code. When you finish the full game will get unlocked (or you will see an error message if you misspelled the code).