I found a solution.
Download the latest Epson Software and save to USB.
Disconnect your PC from the internet.
Do a clean install of Windows 11.
Install Epson software.
Now the Epson software with my V600 works like a charm on Windows 11.
Now connect your PC to the internet.
I have experienced this sort of thing many times over the years. Something about installing older software while being connected to the internet.