Uh, Zorlun will have to check himself, but I remember for other games, authors saying that Steam rules were similar to Patreon ones, so, if that is the case, the version you would get on Steam would not be the one you get through here (with Prometheus one), but the Patreon one.
Not a problem if you do not want the Prometheus patch version, or you can always get it on Steam to support Zorlun and then download it from here, but just be aware, so if that happens you do not complain after, Zorlun gets already enough complaints