Visual Composer says I need to activate a license?
The full version of Visual Composer comes with this theme. You do not need to activate any license to use it.
You are only asked for a license if you want to receive automatic plugin updates from the Visual Composer developers. To get a license you need to purchase the plugin yourself.
I would not recommend doing this as the plugin updates may be incompatible with the theme. I suggest waiting for the theme updates which will come with the Visual Composer updates.