I have been trying to update and it just hangs right as the video corrupts. In normal boot that happens as it turns on the second monitor and quickly recovers. I had to add SSDT-EC.aml to my CLOVER/ACPI/patched folder to get the install to work. Other than that it was a pretty standard...
Installing Catalina final release from scratch or via in place upgrade both have same result for me. Boot to install and about 3-5% progress on the bar and for hour or more... nothing happens. The machine had working Mojave before and install was pretty straight forward. Heard someone said...
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