The deal is that if you're a Patreon supporter you get new versions before everybody else does. v1.35 is the current Itch and Steam version, so your Itch app is working correctly.
Right now the only player-made mods are available on Steam Workshop. I'm not aware of anybody distributing mods outside of it. If you like, I can give you a Steam key.
Viewing post in September Patreon Reward: Fleshcult v1.39 comments
That would be interesting to see if it works despite the Game not being able to be found on Steam where I live.
I mean we can try - do you need my Steam-Handle for that or can you send it via Mail or some other way through here - I haven't seen any personal message option here on itch.io, so I dunno how to do it yet.