I am having that issue now, and I will attempt the process that worked for you. I have kept the machine in its most reasonable standard state (meaning, I don't often update the OS), so I will be on the lookout for massive changes!
Thanks for the additional info. The EasyFix said it was successful, but the Adobe connection came up with the same error regarding no internet. I bet that I have gaps in my MS updates and that the TLS fix alone wasn't enough.
So, instead, I just did an OFFLINE ACTIVATION (a few back and forths between computers using email!) and PPro came up normally after I entered the final response code. I confirmed my registration on Adobe.com is still good (serial number), but without internet connection, it shows I have no activated devices. I was hoping it might say OFFLINE device or something.
In any case, the test will be 8 days from now, when Ppro won't work if its self-destruct mechanism wasn't turned off!