Sierra to Catalina

Hey chaps, I finally took a deep breath and tried to upgrade Sierra to Catalina. I'm getting to USB, Clover fine, and to the Catalina installer. When I run the installer, the progress bar goes very quickly. Something like 5 mins (I would expect 40). At the end, the screen breaks and tears and it puts me back to recovery utilities. Although at this point the screen is unreadable so I can't do anything but reboot.

The build should be safe - GA Z77 DS3H and correspondingly old i5. As I...

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