Sorry I'm such a late arrival but I also had a heck of a time getting the trainer to work for MEC. Another person posted to basically keep pressing F1 and it would work eventually. That was true for me, but what I found worked even better (Windows 8.1) was to launch the trainer first like normal, launch the game, ESC to the pause/game menu, and instead of pressing F1, ALT + TAB to exit back to Windows desktop, I would see the trainer sitting there with "game not found" status... and there press F1 and it loads every time "Trainer Activated" Game Found, then just click back into the game on the Windows task bar and it works perfectly, every time for me. Hope this helps others.
Your trick is actually what works! Thx!
Yeah, it's 2022, and this trainer still doesn't work. I have done everything everyone suggested, and the trainer won't find the game.
are you using origin? or the new launcher?