Digital of Retail? It's important. The code in both sources differ. It's like updating two games when a patch comes out for this game :/
@Borgert, that comment would be more appropriate in the thread for clear sky itself.
[Edited by PhoenixCH, 10/24/2010 3:05:12 AM]
No, people are saying that the popularity option worked in the first release of the trainer for this game.