Hello,
You don’t need to pay anything if plugin is bundled with theme! Read more about bundled plugins https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins If you need to update plugin you can always get the latest plugin archive here https://www.8theme.com/downloads
So, install the latest version of the WPBakery plugin and use it to compose your page content and footer.
Regards
