This fix/patch is currently working and tested on the newest GOG version as of July 5th. From a quick look at the file structure of the Steam version it almost looks like a different port of the game... I will see if I can implement the framerate fix on the steam version as well when I get a chance. I will also update the descriptions of these unity fixes I've been uploading to be more specific of the storefront/game version I test/patch with
So far I've had luck with 60hz fix's for a few unity games that I've had this issue with personally (Alex Kidd, Actraiser, Deadly Premonition 2, Exo One, and Tormented Souls). And I've tried and failed to fix/patch Disco Elysium, Empyrion Galactic Survival, and Final Fantasy VI Pixel Remaster, but I'm sure I'll keep trying as I have time.
And yeah I don't think this is as much a problem anymore with newer Unity titles. I think Unity corrected the default Fixed Timestep setting maybe within the past year? Though it seems some devs are still managing to mess it up. I really wish the devs of these older games would just fix their code...