Backed up my 10.15.2 installation - of course. Checked my /L/E folder and found a duplicate FakeSCM kext (deleted), a deprecated internet kext (deleted), and an old IntelMausiEthernet kext (deleted). (I was impressed with myself as I had labeled these kexts when I installed them with a red dot so that I could easily find them later.) Put new IntelMausiEthernet kext in /EFI/Clover/Kexts/Other, updated FakeSMC, Lilu and WateverGreen kexts that were already there. Restarted and tested O.K.
Installed Clover 5103, restarted and tested O.K. Tried replacing FakeSMC with VirtualSMC, rebooted and boot failed. Restarted from my backup and restored FakeSMC. Tested and all was well again.
Ran update from System Preferences and after several restarts and waiting... waiting... waiting... success! Overall a pretty easy update. Someday I may try again with VirtualSMC, but I might just wait for my next Hackintosh build (in the planning stage) as I am a bit busy at the moment.