Flash installation fails v25 Firefox Windows 10

Yesterday, when all my troubles seemed so far away, Adobe Flash V24 was working.

Then, on insistence of Firefox I tried standard version upgrade from:

Adobe - Install Adobe Flash Player at link

Adobe Flash Player Install for all versions

...which failed as below.

After reading reams of postings I did a fresh restart and followed the directions at:

Uninstall Flash Player for Windows

After confirming uninstall

"Sorry, Flash Player is either not installed or not enabled.

Please go to step 2.

...and selecting step 2

Adobe - Install Adobe Flash Player

I still get the message:

""Adobe Download Manager has stopped working"

At which point Adobe Flash player installer still requires

"Next"

Which results in

"installation will begin shortly"

...Which does not happen in 15 minutes

So X out results in

Adobe Flash Player could not be installed.

Which is another iteration of the loop -- GOTO TOP

Ideas?

This problem is not new to this release, I have had it before and once found some arcane process to defeat the automagic failure; which, unfortunately I have forgotten.