This is an inherited old computer and has been running Mojave for some time but never had Adobe products installed. Thank you for the link, but as I noted in my post I was able to validate my Adobe ID in the browser on the subject computer and then see the Adobe Application Manager move to the next step asking me to accept the license agreement, which I do, and then goes to the screen for Serial Number Validation and says "please connect to the internet to validate your serial number." It will not go past this point even though I've verified that I can ping the server, have reset hosts, have the cert and can connect (thus have done everything advised in that link).
... View more