is a bittersweet milestone. On one hand, it is the most stable, secure version of Acrobat XI ever released. If you are forced to run legacy software, patch 11.0.23 is mandatory—do not skip it. It will fix crashing, improve PDF printing, and protect you from the most famous exploits of the 2015–2017 era.
: It remains available via the Adobe Release Notes archive, typically as an .msp (patch) file for Windows and a .dmg for macOS. Important Considerations adobe acrobat xi update 11.0.23