Hi Gaurav443.,

Plugins are included in our theme package, there is no need for you to purchase them. However, if you want premium features of the plugin and premium support, only then do you need to purchase a separate license for it.

More info can be read here: http://docs.wedesignthemes.com/dt_articles/how-to-get-updated-theme-premium-plugins/

For more information please check the Envato regular license definitions here → http://themeforest.net/licenses/terms/regular

Thanks!!