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:
1. Upload the recent version of the theme from Themeforest account.
2. Navigate to Plugins and deactivate the current plugin, you will see “Delete option”, delete the current plugin
3. Upload the plugin archive from theme/inc/plugins/js_composer via Plugin > Add new > Upload > install > activate
Best Regards