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Once you have successfully downloaded the update file, follow these system-specific execution steps. For Windows Users (.msp files) Close all running Adobe applications and web browsers. Right-click the downloaded update file. Select Run as Administrator . Follow the setup wizard prompts to apply the patch. adobe acrobat pro dc 2015 update download
Since Adobe has retired the licensing servers for the 2015 versions, you may encounter errors saying the "Serial number is invalid" or "Connection failed." Let me know your situation to narrow down the best solution
Run the Adobe Acrobat Clean Up Tool, reinstall the base 2015 app, then apply the update. Mismatched software tracks (Continuous vs. Classic). reinstall the base 2015 app
Adobe Acrobat Pro DC 2015 Update Download: The Ultimate Guide