I downloaded the SOULCOOM_mac.zip and that's what I tried running, on OS Monterey 12.2.1. I'm not a patron either. It is quite confusing Q_Q
I'm here to help, but I need a bit more info to get things sorted.
Check out this video (https://soulcoom.itch.io/soulcoom-dev/devlog/568460/faq-how-to-signup) and give me a shout with the step number you're stuck on. It's Windows but the login process is the same.