I've never been able to update Revolution slider and WPBakery. Is it necessary? having BeTheme is it possible or it is necessary an additional license?
If you are using these plugins it is always good to have them up-to-date.
You can update the bundled plugin from Betheme -> install plugins.
If the newest version is not available yet, please wait for it. The plugins you buy with the theme are not premium plugins. If you want instant updates, you have to purchase the plugins separately.