When you purchase a theme from ThemeForest that bundles Uncode WPBakery Page Builder, Revolution Slider and Layer Slider, you are free to use these Premium plugins with the theme.
However, your Uncode purchase does not give you individual Uncode WPBakery Page Builder, Revolution Slider and Layer Slider licenses that allow you to activate or download these plugins as you wish. Activation doesn’t mean the plugin will not work but only that you cannot received direct updates. Please don’t worry if you see warning messages about the plugin license activation.
You can use these plugins with the Uncode theme, and you are fully compliant with the Envato’s policy, but you cannot activate them as the owner (so don’t try to use the Uncode purchase code to activate one of these plugins).
According to Envato’s licensing rules, new plugin updates can only be issued when we issue new theme updates. Anytime Uncode is updated, the latest plugin version for Uncode WPBakery Page Builder, Revolution Slider and Layer Slider will be included for free, so you don’t need to buy your own licenses to properly work with the plugins.
These rules ensure we will fully test plugins to make certain there are no bugs that will conflict with our own update. We also fully test new theme versions before releasing them to our customers.