While version 11.0.22 was intended to be the last, Adobe released 11.0.23 as a planned update to provide one final layer of security and bug fixes for users who weren't yet ready to move to the subscription-based Acrobat Reader DC The Final Fixes
The Portable Document Format (PDF) has long been the global standard for electronic document exchange. For much of the early 21st century, "Adobe Reader" was synonymous with the PDF format itself. Released in October 2012, Adobe Reader XI (version 11.0.0) marked the eleventh major version of the free viewer. It was designed to address the growing complexities of document interaction while responding to an increasingly hostile threat landscape. adobe reader xi version 11.0.23