When you activate the theme you will be redirected to a welcome screen where you can find some information about theme installations and status of required plugins along with the help and link to documentations and support center.
Click on Begin installing plugins
And install and activate all plugins:
The most important one is the Hubble Theme Plugin.
The WPBakery Visual Composer plugin is essential to build pages of the theme.
The Envato Market will help you update your theme automatically.