If your site is not loading, there can be various reasons. One of the simple reasons can be php version. Most of these plugin need php 5.3 or above( 3rd party libraries using namespaces etc make it a requirement).
What is your php version? Also, It will be easier to help if you can enable “WP_DEBUG” and then post the actual error.
I just saw that plugin is looking for maintainer at the moment, so I will recommend looking for well maintained plugins.