i cant sign in to an account, it just says error unsupported platform and ive redownloaded it on itchio loads of times and i still have the same problem
That's because the devs have ended support for the itch.io version. If you can't use Steam (like me) or refuse to do so (which there's plenty of good reasons for now), contact support and demand they fix it or give you a refund.
The two email addresses are provided in different places as contact addresses for the devs:
us@innersloth.com
support@innersloth.com
If they don't reply, reach out to itch.io directly after giving them some time. I'm waiting until my later contact (I got the "us" address from itch.io's contact page earlier, then contacted "support" a few days after) has been waiting for a week before I take a next step toward getting answers.