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Vanilla 2.2 - the stable gold release - can now be downloaded. The upgrade instructions are in the README.md as part of the download.
Vanilla 2.2 requires PHP 5.3. This is a change from the 2.1 series which only required PHP 5.2. The next release (2.3) will require PHP 5.4. We strongly recommend upgrading to PHP 5.6 as soon as possible. Contact your host and request it if you don't have control over it. It's IMPORTANT!
Critical upgrading notes:
We strongly recommend testing your plugin and theme compatibility in a safe place before upgrading your production forum.
IF YOU HAVE TROUBLE UPGRADING AND NEED ASSISTANCE, PLEASE START A NEW DISCUSSION. If you are a developer and locate a reproducible issue, please file it on our GitHub tracker, noting your version as 2.2 exactly. We greatly appreciate the assistance.
Support for 2.1 ends immediately. Please upgrade to 2.2 as soon as possible.