Can't activate Acrobat 8.0 perpetual license (that I've owned since purchase) via internet or phone

I purchased Acrobat Pro 8.0 perpetual license some years ago.  I now have a new computer (Win 11) and wish to continue to use my software.  I have successfully installed it, and it works fine, except that activition requirement options are no longer available.  Internet servers appear to not be available, and the phone options listed in the software are "no longer in service".  I get a "free to use for 30 days" message, and it functions fine thus far.  Now, I realize this is an old software product, but like the old car that I drive, it is my option to continue to use it (at least as long as gas is available, and Windows 11 supports the functions I need).  I have only one other computer on which it is used (Win 10), but that isn't the issue - can't even get to that part of the question.  The issue is access to the activation in the first place.

Now, I guess I respect that Adobe has switched to a subscription model, but I'm not interested in that.  I only use my Acrobat Pro infrequently, but I wish to continue to do so.  I paid probably $800 for the perpetual license, some years ago, and with our inflation and alternative return on investment history over those years, that payment is worth thousands of dollars today for Adobe.   I just wish to activate my old software, and continue to drive off into the sunset as an old grump.  Please?