Witcher, The (Enhanced) Discussion
It doesn't matter if you try to use the trainer offline only; what version of IE you have; your URLMON, etc. If you are running Windows 10, the non-Steam version of this trainer *will* crash upon trying to authenticate.
Cheathappens only updated the trainers at the top of the list if they were released before July 2012 to be compatible with modern systems. This Link explains how you might be able to get Windows 7 to allow the trainer to work (Windows 8 MIGHT work if you delete IE first) but this trainer will not function on Windows 10 unless it is updated by Cheathappens, which PWizard has made clear that they have no intention to do.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem