Point to note: Depending on your purchased theme, screenshots can vary.
If you're getting purchase/activate notification for WPBakery or Slider Revolution then don't worry. You don't need to buy any of these plugins if you don't want to access their premium templates.
Such messages can appear under plugin or WordPress notification section. We have distributed these plugins under EXTENDED LICENSE and you have licensed plugin. We'll keep required plugins updated during the life time of the theme.
Please follow UPDATE Plugin (Update is not applicable for Consultix) article to update these premium plugins. We usually release update of these plugins within 24 hours of their release.