While Adobe has shifted to the "Continuous" track with Acrobat Reader DC, version 11.0.23 is favored for several reasons:
Technical White Paper: Adobe Reader XI (11.0.23) Offline Installer Executive Summary adobe reader xi 11.0 23 offline installer
Because Adobe has removed all XI versions from its official website, you must rely on . Always scan downloads with VirusTotal before running. While Adobe has shifted to the "Continuous" track
Use only for air-gapped, legacy, or testing environments. For general use, avoid at all costs. or testing environments. For general use
Released on November 14, 2017, version 11.0.23 was pushed as a planned, cumulative security and maintenance update. The Final Iteration
Better performance on older hardware or legacy Windows versions like Windows 7.
: It was the last stable version for older operating systems that might struggle with the modern Acrobat DC.