Vanilla 2.6 is here
! It includes security fixes and requires PHP 7.0. We have therefore ALSO released Vanilla 2.5.2
with security patches if you are still on PHP 5.6 to give you additional time to upgrade.
It seems that addon downloads (http://vanillaforums.org/addons) no longer start automatically. I found a lot of JS/jQuery errors via Web console on that site, might be related.