Please note that XenForo 2.0.x has higher system requirements than XenForo 1.x. The forthcoming XenForo 2.1.x release will have higher system requirements again (PHP 5.6).
The following are minimum requirements: PHP 5.4 or newer (PHP 7.2 recommended)
MySQL 5.5 and newer (Also compatible with MariaDB/Percona etc.)
All of the official add-ons require XenForo 2.0.
Enhanced Search requires at least Elasticsearch 2.0. Installation and Upgrade Instructions for XenForo 2.0
Full details of how to install and upgrade XenForo can be found in the