vagabondaddiction Beta can only be obtained if you have filled out a form before. At the end of that form, there was an offer to participate in beta testing. So if you didn’t do it earlier, now you can just wait for a fixed public version.
I filled out the form, but refused to participate in the beta (there were six months of “beta quality” of updates). So we’re waiting for a common feedback from testers, and normal, adequately working firmware.