SUCCESS

I did following (using helpful info in earlier posts *)
Downloaded AvastClear.exe and avast_internet_security_setup_offline.exe
Uninstall of Avast Internet Security via Control Panel
Ran AvastClear (went to Safe mode when asked)
Install
Setup
Connected Wifi
Activated ( ie I am using paid version)
Completed setup.
Took a about 60 minutes (mostly: download, reading, checking, documenting, restorePoint and other paranoid behavior <grin>)
A BONUS: Behavior shield now can be switched ON (previously I could not get the ON setting to Stay]
-------
Reference the helpful POST by bob3160
"Clean Install of Avast:
https://goo.gl/4PtzkfIf you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A"