Hi Juanito: hplip is now o.k.
When I retried the hplip install, I noticed that no dependencies were
being accessed, that hplip.tcz was being installed immediately, resulting
in the error message hplip.tcz failed.
In the midst of all my thrashing around, I might have installed the old hplip
previously, with the old dependencies in place. I guessed that perhaps
that might be the cause of the failure.
On another one of my machines, I started from scratch, reinstalling a fresh
copy of CorePlus 9.0. This time, hplip.tcz installed fine, loading a large
number of dependencies first, with hplip.tcz loaded as the last step.
My HP Envy 7640 was detected as a network printer; I installed it with the
HP Envy Photo 7100 driver as the closest match. It works fine.
Many thanks to you, Rich, and coreplayer2 for guiding me through all this !!
Len E.