This mornings post (and the previous week's posts) were in error. Snort 18.104.22.168's EOL date is 90 days past the release of 2.9.1.
Snort 2.9.1 was released on August 23rd. That places our 90 day window at November 23rd. We apologize for any panic and inconvenience this may have caused.
We do highly recommend you take the next month to upgrade to Snort 22.214.171.124. It should be our last release (unless something catastrophic comes up) until Snort 2.9.2.