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Vanilla 2.3 - the stable gold release - can now be downloaded. The upgrade instructions are in the README.md as part of the download.
Critical upgrading notes:
Vanilla 2.3 requires PHP 5.4 which is a change from earlier versions. We strongly recommend upgrading to PHP 5.6 or PHP 7.0 as soon as possible. Many hosting plans allow a seamless transition via their control panel.
You must follow the normal upgrade process, including running /utility/update.
Support for 2.2 ends immediately. Please upgrade to 2.3 as soon as possible.