XenForo 2.1.9 Released | XenForo 2.1.9 Released null | Add-ons Released XenForo 2.1.9 is now available for all licensed customers to download. We recommend that all customers running previous versions of XenForo 2.1 upgrade to this release to benefit from increased stability. Where necessary, the merge system within the "outdated templates" page should be used to integrate these changes. As always, new releases of XenForo are free to download for all customers with active licenses, who may now grab the new version from the customer area. Note: add-ons, customizations and styles made for XenForo 1.x are not compatible with XenForo 2.x. If your site relies upon these for essential functionality, ensure that a XenForo 2 version exists before you start to upgrade. We strongly recommend you make a backup before attempting an upgrade. Current Requirements Please note that XenForo 2.1.x has higher system requirements than XenForo 1.x. The following are minimum requirements: PHP 5.6 or newer (PHP 7.3 recommended) MySQL 5.5 and newer (Also compatible with MariaDB/Percona etc.) All of the official add-ons require XenForo 2.1. Enhanced Search requires at least Elasticsearch 2.0.