https://relaunch.pdir.de/docs/en/contao/extensions/klaro/requirements/Contao 4 Note Contao 4 requires a web server such as Apache or NGINX with PHP and MySQL support. Our Klaro module requires Contao 4.9 or higher and PHP 7.2. Contao Manager Contao Klaro is easy to install with the Contao Manager. Just search for Contao Klaro.Hugoen-US