I hope you are well today and thank you for your question.
Please note that you are using the WPbakery page builder plugin bundled with the theme therefore you are not a direct customer of that plugin and cannot update that plugin until you purchase it.
Please find more information about it on the following page.
We update the plugin with every new theme version. In this case, you can just delete old plugin version and reinstall latest plugin version bundled with the theme from Appearance -> Install Plugins