Here is the developed content regarding , structured for different use cases (e.g., a knowledge base article, a software download page, or an internal IT notice). 1. Technical Summary & Context Adobe Reader XI (version 11.0.23) is the final, end-of-life release of the Adobe Reader XI product line. Version 11.0.23 specifically refers to the last security and stability patch released for this series before Adobe discontinued support on October 15, 2017 .