rovernic

I have had the exact same problem with the demo's. When i say demo's I mean literally every source from the demo page. All say that the licence is messed up and i need to give an activation code. It then says thanks for trying the demo please buy the game to keep playing. I never buy a game I don't play the demo of (to make sure 1. I like it and 2. It works on my pc) So any help concerning this matter would be most appreciated