As you can see from our EOL page:
The EOL for Snort 188.8.131.52 is approaching in a couple days. From our download statistics, the percentage of people is pretty small.
Please try and update your engines this week to 184.108.40.206, the current version. We also look forward to the release of 220.127.116.11 in the coming weeks, so for those of you still on 18.104.22.168, the EOL for 22.214.171.124 will be the release of 126.96.36.199 + 90 days (as a reminder).
So, 188.8.131.52 users, your EOL is coming too, and there are tens of thousands of you on that version. It's upgrade time!