Hi There @TeamEquipe
Thanks for writing in! You don't need to activate any plugins that comes with X/Pro in-order to use it with standard features. Layer slider related can be seen from here (https://theme.co/apex/forum/t/extension-layerslider/70).
However for premium functionality, you will need to purchase the plugin separately. The plugin developers created this premium features exclusively to motivate users to purchase their products directly from them.
Thanks for understanding