For anyone using an HDMI/DVI Output, learn from my mistakes....
Radeon RX560 4GB HDMI/DVI "No Signal" on monitor/tv display.
The install was actually 100% successful, it was headless though - meaning as soon as I got past the Apple loading screen on the "Install MacOs" (using the update method), it turned off my display "No signal".
There's actually regular mac / imac / mac mini users (I'm sure a few are legit?) that have put reports to Apple about the issue, but none of the recommendations from them have worked.
IMPORTANT: My Recovery ended up being overwritten by the automatic Catalina install process which lasted about 30 minutes, so HDMI didn't work in Recovery mode either.
I had to revert back to Mojave 10.14 using TIME MACHINE by booting into Mojave Install using USB and Time Machine System Recovery.
I have updated to the latest Clover, AppleACL, Wintergreen, Lilu, etc.
If anyone had this problem and knows how to fix the HDMI issue, please let me know. I'd prefer an actual solution because the restore process took 3 1/2 hours.