I'm trying to install Davinci Resolve, for which I need OpenCL on my AMD Radeon graphics driver. Whether I run the install script of the Ubuntu 20.04 driver or install the packages of the Ubuntu 16.04 driver manually, it will always fail at amdgpu-pro-dkms, even with dkms installed.
It's highly recommendable not to use AMDs restricted drivers on Linux it may break your system.
That said, try with;
amdgpu-install --usecase=opencl --no-dkms
I think I wanted to try that earlier in recovery mode, but I forgot to turn on networking and after fixing that, I forgot to run it with these two options.
It went through, but Resolve is still complaining about unsupported GPU mode. I think I leave it be and reinstall Zorin for a final time.