Hello,
WPBakery Page Builder and Revolution slider come 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.
In order to update the plugin, navigate to Appearance > Install plugins > try to update the plugin.
If there are any problems, upload the plugin from your profile on this forum and update via FTP.
Best Regards