In some of our themes, we included premium plugins for free. We purchased them and included them in the theme package. We are not allowed to include the license key for each of them. If there is any update, we are accountable for updating the theme with the newest version of plugins. In fact, the license key will not help you anything even updating plugins to the newest version. Only direct buyers can do this. Because we provide those with the themes; therefore, we will take care of updating them for our customers.
You can ignore all the warning about “update” or “authorize this site“. If you want to activate the auto update of the plugins or get premium support for each plugins you will need to buy a license yourself.