Adobe Flash Player ESR - RIP

The Extended Support Release was originally created to help minimize the time IT administrators spend certifying a new Flash Player release, by restricting the number of changes introduced in a given release to only security changes and critical functional fixes. At the time, functional changes far outweighed the number of security fixes included with each release of Flash Player. In the modern security landscape; however, the opposite is true and the combination of proactive and responsive security mitigations far outweigh functional changes. In practice, the ESR no longer insulates IT organizations from the vast majority of changes included in the standard Flash Player release, providing little relief in terms of reduced functional risk As a result, we have decided to discontinue the ESR branch and instead focus solely on the standard release. Focusing on the standard release allows us to be more agile in response scenarios, and to focus more deeply on both testing and new security engineering efforts moving forward.
 
The final release of the ESR occurred on October 11, 2016 and it is now discontinued.
https://www.adobe.com/support/flashplayer/debug_downloads.html