OK, time for an update. After about 8 HOURS of failed attempts, I can now use my printer on Win 10! The first six tries failed miserably (printer was connected, printer wasn't connected, printer couldn't be found, etc., etc., etc.....
.) THEN it finally installed TWO versions of itself,
and pronounced one of them as the default printer. Several attempts to print failed, giving only the info "Printer is in an error state" (Alaska? Florida?) Finally I switched to the OTHER installation as the default printer, and now it works flawlessly!
Deleted the no-go one to prevent any coup attempts, so we should be alright.
Mind you, I'm not blaming ALL of this on HP! Any eight year old could probably have done this procedure in about ten minutes, but for an old fart like me, it is exasperating!!
John