I got a reply from the Zorin developers which stated:
quote:
The following guide may help you to install the proprietary AMD graphics card drivers in Zorin OS 15:
- Install the latest software updates by going to the Zorin menu > search & open "Software Updater"
- Download the Ubuntu 18.04.5 HWE version of the AMD driver from here
- Open the file browser and navigate to the "Downloads" folder
- Right-click on the amdgpu-pro .tar.xz file and select "Extract Here"
- Open the newly-extracted folder and double click on the "amdgpu-install" file to "Display" it
- Press Ctrl+F to search for "ubuntu" and replace the "ubuntu" text with "zorin" (without quotes)
- Save the file and close the text editor app
- In the file browser, right-click on an empty place in the folder and click "Open in Terminal"
- Enter this command to install the drivers: ./amdgpu-pro-install -y
After the installation is complete, please restart your computer to apply the changes.
end quote
As this is something I had done before my post about the tweaks and the caveat, I already know this will send me into a loop during the login and wont let me enter the system. I've told them about this result and what happens and am hoping they can come back with something that works.
Right now I'm giving consideration in going over to the dark side and installing Windows 10 on a spare hard drive just so I can get the full use of the system. That's something I'm not happy about doing.
to mark the thread as solved, it will help the future visitor for this site who might have the same issue as you had.