I am stuck at 10.15.1 as well. Was running 10.15.5 b4, and then did a CMD-R restart, and re-install OS. It apparently re-installed 10.15.1, and even though my maching is enrolled in beta, it won't show any new betas. Its just not seeing it for some reason. I can't seem to find a link to get to the actual 10.15.5 b4 file to just download and install it, instead of using the SYSTEM SETTINGS updater.
BHeess
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