the developers (on top of alot of other crap) made two versions of the game so that people with old systems/graphics/OS can still try to play the game. trainer only works with the executable showdown_avx.exe
likely your computer is either
old crappy graphics card ancient operating system (like windows xp) all of the above
and uses the other exectutable showdown.exe
my computer won't even run that file so our trainer (for now) doesn't work with the version of the game for decrepid computers.