Hey y'all, Kai again!
At the moment you would need to donate through either Ko-fi, OpenCollective, or purchase the Discord Subscription to get beta/alpha access. In addition, you would need to be a member of the Discord server to be able to download these builds. You cannot use your Itch.io or Microsoft Store license to get beta/alpha access.
This all is subject to change as Cider 2.3.0 releases today (hopefully, if everything goes smoothly).
As always, if you have any other questions feel free to respond to this, open a new topic in the Itch.io forum, or open a ticket in the Cider Discord!