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Having lots of issues. All is slow and gets stuck. Waiting for official release and then a full reformat. Let’s hope for the 4th :) maybe next year I’ll abstain from the betas, also for iOS.
I am in the same situation, looking forward for Catalina to a full reinstall…
 
Not the GM. It's still reported as "Beta" in About This Mac, and still has a letter added to the build number. This is likely the GM candidate.
macOS Catalina 10.15 GM seed (19A582a) https://developer.apple.com/news/releases/?id=10032019a
19A582a.png
 
Not the GM. It's still reported as "Beta" in About This Mac, and still has a letter added to the build number. This is likely the GM candidate.
Apple calls it the GM build and the buildnumber is the same as the one from Beta 11.
So Beta 11 = GM.
 
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