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Many thanks for the solution to a real problem, and the precisely detailed instructions.

In addition, I have opened Acrobat X Pro and went to Edit > Preferences > Updater and put a tick in the last option to prevent automatic updating from causing the same problem to reappear through that open door that the application uses to “call home” to Adobe corporate. Adobe is IMO the unethical inventor of this problem that is a ploy to sell the “fix” that is an “upgrade” to their subscription service. I believe Adobe is simply blacklisting bona fide serials on their older permanent license software to force “upgrades” to be made to their subscription service Acrobat DC version. It is a greed motivated “security alert” that your Acrobat is not genuine more than a fact, IMO.

I also feel the same way about Adobe, which is why I plan on continue to use Acrobat 10 Pro for the foreseeable future. Adobe also said the that message would appear for only 3 months, but has continued for well over 1-2 years. You are right, it's all an effort to make the user upgrade to a subscription service, one which takes away options that used to come with 10 or 11.

Glad you found the information useful. If you know of others having the same problem please share that information with them.

Good luck my friend!