I am getting the same issue, could it be a gamepass related thing rather than a game related thing?
That could be yes. Usually they tend to work together, but sometimes gamepass does some weird stuff.
when trying to use this trainer, i get this debug message:
19:43:55: Sniper Elite 5, 2.31 (STEAM/WINDOWSSTORE/XBOXGAMEPASS), Last modified: 01/01/0001 00:00:00
19:44:13: Successfully attached to Sniper5_dx12
19:44:13: Module Engine: Failed checking at CreateToolhelp32Snapshot
19:44:13: Collect Fix Reload, Script error in line 1: The module name '$process' does not exist!
That did not happen the last time i used it, reckon bout 5 or so months ago.
Other trainers for other games work just fine, so something about this one is off.
are you launching the game from a supported launcher?