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Adobe has shut down many older activation servers. Even legitimate serial keys may no longer work on new installations, and third-party keys are frequently flagged as fraudulent and deactivated. Risks of "Exclusive" Patches
The search for a "full patch" or "exclusive" activation for typically refers to unauthorized third-party cracks or serial key generators. It is highly recommended to avoid these due to severe security risks and the fact that this specific version is now obsolete. Status of Acrobat Pro DC 2015 Adobe has shut down many older activation servers
The specific version Adobe Acrobat Pro DC 2015.023.20053 refers to a "Continuous Track" update officially released by Adobe on January 10, 2017 Adobe has shut down many older activation servers