Been going through the trouble shooting list over how to get this trainer to work, been going down it pretty hardcore and still unable to get the thing to remotely open and give me it's menu contents. Even through compatibility or run admin it's just no wanting to open up and greet me with a "Hello and welcome to Thief Trainer, I shall be your guide." None of that..it's me nuts! Every trainer I have works fine, this is the first time I had anything wrong that was not solved by trouble shooting, it's perplexing me a lot. Everyone here seems to have theirs working some...I know I can't ask much help since I all ready am using the trouble shooting and its list is getting very thin and still no conclusion.
You should try and go to the game directory e.g. (c:\Program Files (x86)\Thief\Binaries) and see if you have a Win64 directory. If you have it then inside you have the launch file for the Thief 64bit. Try it and it should work, that did the trick for me.
Regarding the trainer the only problem I have is that I can't get the gold option to work, i'm not getting any gold