# Requirements and compatibility
In order to work, XTDir for SobiPro requires the following server software environment:
- Joomla! 3+, or superior - Please download the latest version at Joomla!.
- PHP 5.3.10 +, or superior - General-purpose server-side scripting language for web development and a popular open-source database system..
- SobiPro 1.3+, or superior
- MySQL 5.5+, or superior (recommended).
- PHP memory_limit 64 M, or more (recommended).
XTDir keeps backwards compatibility with previous SobiPro versions. Please, remember to verify SobiPro requirements here: https://www.sigsiu.net/center/sobipro-component/98-requirements.
From Sigsiu's Archive: Please note: NO SUPPORT is given for older versions of SobiPro: SobiPro 1.2, 1.1 and 1.0.
**XTDir 5.6.4 ** is the last versions compatible with Joomla 2.5.28. It are is for download, but we do not longer offer active support (no more new features, enhancements and bug fixes for Joomla 2.5). If you have an issue, please, send us a ticket and we will try our best to answer your questions. Keep in mind that every day your alternatives are closing down. Joomla 2.5 is not longer supported by Joomla community (end-of-life December 31, 2014) and JED removed J25 extensions on June 30, 2015 . It is highly recommended to upgrade to Joomla 3 as soon as possible.