https://relaunch.pdir.de/docs/en/contao/themes/mate/requirements/Note The theme can only be installed into an empty Contao installation and is compatible with Contao 4.4 or higher. Contao 5 Contao system requirements Version 3.0.0 of the MATE theme requires at least Contao 5.0.0 and PHP 8.0. Tip We recommend Contao 5.3 with PHP version 8.3 or higher to achieve the best possible loading time with our theme!Hugoen-US