http://blog.snort.org/2011/10/snort-2861-isnt-eol-yet.html
November 23, 2011 marks the end of life for Snort 2.8.6.1 rule support. So there will be one more Snort rule build will be the last version built with this support in it.
The current version of Snort is 2.9.1.2 and is available for download here: https://www.snort.org/downloads