I have the same problem on MacMini MacOS Monterey 12.6.5, neither the stable version nor the early access won't start, the windows will open and close immediately again.
I'm a little worried that no one from Pico support has bothered to make a reply even to say that they are aware and working on it - that would be nice. Otherwise I can't use any new features being added!
Perhaps there's only a few of us using this early access software so its not important?
The officially supported O/S versions are macOS 13 (Ventura) and 12 (Monterey), if you are having problems the best approach is to contact support@picotech.com directly.