Reader DC closes after approx 20 seconds

Reader DC Version 20.012.20048  

Windows 10

Reader DC closes after 20 seconds with no error message

Things I have tried:

Searched out the EULA file and 'Accepted'

Turned off enhanced security

UN installed, deleted all Adobe folders from x86 program data and program files

    then re-installed

Tried the 'Check for updates'    'fix'

Tried to 'Repair installation'       Reader closes before this completes

What can I do next??     Thank you  !   Jeff C