Acrobat Xi Pro 11.0.16 | Adobe

The version number is a specific patch level. Adobe regularly issued updates to address bugs and security vulnerabilities. The .16 update, rolled out around late 2016 to early 2017, was one of the final cumulative patches for Acrobat XI. It included:

Alternatives worth considering (free or cheaper): Adobe Acrobat XI Pro 11.0.16

To run smoothly, your system must have been built for the mid-2010s. Here are the official requirements: The version number is a specific patch level

Adobe officially ended support for Acrobat XI on October 15, 2017 . Adobe Acrobat XI Pro 11.0.16