BlackCat CMS is an Open Source PHP Content Management System built with PHP 7 and mariaDB. Visit the project website for more information.
Currently there is no installable version of BlackCat CMS v2.x available. If you want to install the engine anyway, please download the current master.zip, unzip it to any directory and run
composer install
from inside the vendor folder to get all the dependencies.
Please note that you will need additional modules and templates to do something useful with the engine.