Snort will shut down versions of Snort that make up less than 10 percent of its downloads or have been around for five years. Version 2.9.11.0 should be sunsetted on Jan. 9, 2019. We encourage everyone to upgrade to the latest Snort version 2.12.0.0. This serves as the 90-day notice until EOL, which should occur on or about Jan.9, 2019, is the 90 day notice until the end of the current release.”]
Source: https://blog.snort.org/2018/10/29110-end-of-life-warning.html