Hello,
This is the notification message that comes when you use the premium plugins. You don’t need to worry about this.
WPBakery Page Builder comes bundled with our theme but they can’t be activated with our purchase code. Actually, you don’t need to do this. Only in case you want to get free premium support from its author, you can purchase it from Codecanyon. But it is not necessary since we will always provide you with the latest updates. You can update the plugins in Appearance > Install plugins or download the recent versions of the profile on this forum
Regards.
Xtemos Studios.