Trying to get my steam overlay working with gog version and I'm not having any luck, anyone have any idea how to make it work? Trying to use my steam controller.

You'll need a specific file to get the Steam Overlay to work. Placing "steam_api64.dll" into the Darksiders 2 install folder will enable the overlay. You can get this specific file from certain GOG titles like Transistor, or you can get it from select Steam demos, such as The Evil Within demo. Even with this fix, I'm not sure it will allow you to use the Steam controller, since I don't have one.