Adobe Reader XI version 11.0.23 represents the final security update and functional pinnacle of the legacy Adobe Reader XI family. While Adobe has since moved users toward Acrobat Reader DC, many professionals and organizations continue to utilize 11.0.23 for its lightweight footprint and lack of cloud-dependent features.
When installing, it is best practice to install the base Adobe Reader XI (11.0.0) first and then apply the 11.0.23 update patch to ensure all registry entries are correctly configured. Important Considerations adobe reader xi 11.0.23