Snort 2.9.1 is now available at our download link here: https://www.snort.org/downloads. You should be aware that you’ll get some new alerts and things will behave a bit differently with the file_data rule option now because of PAF. Every Friday for the next few weeks we will be posting a new blog post covering the new features of the new version of Snort directly from the Snort Developers. The Snort manual will be up on http://http://manual.snorts.org and http://www.-www.sip for details in a few minutes.”]
Source: https://blog.snort.org/2011/08/snort-291-has-been-released-including.html