I have the same problem My Witcher.exe file in task-manager tells me that i have version 126.96.36.1994 There is no trainer for this version that I can find. I downloaded from Amazon but this game is not showing up in my Steam. I just bought this and the game notes say its version 1.5 but I cannot get any trainer to work.
Just to inform you that The Witcher 188.8.131.524. Is actually 1.5. This was brought up out side of this site. But then I did not use that trainer for the game. Now, if your having problems with the trainer. Set it to Run as Admin. Also if your Steam is set to run as admin the trainer will need to be to. Also Tell you A/V to leave a folder where you keep your trainers alone from the Resident Shield. That should work. As it works via a 32b vista system.