hi. i can't get it to work either. in the screen shot it shows the trainer with the options ticked. I could not get it to tick any of the options. is there something u need to do? thanks.
Works fine for me, I just used it. Are you using the, Orcs Must Die 2 V1.0.0.362 Steam Trainer +7 version? If not, use that one.
Start the game, then start the trainer, go back into the game, then press the key that activates the trainer (Should be F1). Then from there, all you have to do is activate whatever else you want while you're in game at least with the main menu open.
(I don't know if you tried clicking on each box to activate the codes or not but that's not how to activate anything. You have to press the key that is shown right next to each code to make them work.)
Hope I was able to help.