Your post made me decide to try the trainer more thoroughly. I bought the game off steam in North America. (Not sure if this even matters but I want to include any info that may be pertinent.)
I ran the trainer.
Ran the game.
Pressed F1 in the game world (Unlike many if not most CH trainers this one must be activated in the game world, not the opening menu to work properly!)
Tries all the options. I got them to all work.
You may want to try the troubleshooting faq found here:
I hope you get the trainer working. I used the latest trainer, build 2.65.2
I'm sorry it didn't work. You mentioned you were running Windows 8, I'm thinking that may be the issue. I'm running Windows 7 64 bit myself. That looks like the only difference. I hope your other trainers are working well!
Thanks to your post, I've decided to buy this game on steam.