It doesn't respond for me when I hit F1 at the main menu. No indication that it read my keystroke, no "Trainer Activated" sound.
Have you verified that your F1 key is working? Are you on a laptop and maybe you need to press the Fn key first?
Other then that the game got updated since our last trainer release. So please ...
Please use the update notification system to report a game patch, update or to report that the trainer may not be working with the latest version of the game. If 3 or more reports have been filed, consider BOOSTING the priority of this title for a faster turnaround on the updated trainer.