Check that the path is set to the actual game’s executable, rather than the launcher. (Arrow next to the “play” button.
The “click and drag” feature in WeMod is a hit and miss, because people usually click and drag the shortcut on their desktop, which is the launcher, not the game. Use task manager while the game is running if you’re not sure where the executable is exacty.
EDIT - The main issue is likely that the currently available trainer here on WeMod is designed for the Steam version of the game. While some Steam trainers do work on Epic Games, not all of them will. There have been a fair handful of game publishers removing their content from Steam and moving to Epic Games instead, so hopefully WeMod pays more attention to Epic Games versions of games.