Success!
I've tried updating drivers, installing the latest version of the IDE (Arduino program), different cables, you name it. I am not really sure how this came about, but the program uploaded.
After each change like file-renaming, I've re-started the IDE, same result. After each driver change, I've re-started the PC. It is possible I missed a program re-start, but don't think so. After my last post, I re-started IDE, then Tools>Board:Nano>Processor:.... but I chose the ATmega328P option, NOT the Old Bootloader. Get Board Info still returned nothing, but I tried an upload and it worked. I had a new Nano connected at the time, so I connected my project Nano and it worked too.
The only thing I see different is that the previous attempts stopped at "Overriding Baud Rate 57xxx" and this one went to 115xxx, then continued very quickly to completion. Perhaps the newer driver, from wch.cn, is different than the one supplied by Elegoo, in not requiring the Old Bootloader.
Using Port : COM8
Using Programmer : arduino
Overriding Baud Rate : 115200
AVR Part : ATmega328P
Anyway, the project is running just fine. pert, thank you for the attention. Not just for this one, but for all the posts you've made helping users here. Hats off for your perseverance.
Again, many thanks.
Duke