Please take our apologies, but we don’t provide extended support for plugins and that is written in our documentation https://www.8theme.com/demo/docs/royal/#!/external_plugins :
“The plugin activation option was added in the plugin only for the customers to get automatic updates and support directly from plugin developers. Only in case you need this features you will need to purchase and register the plugin. This is not only our practice but all the theme authors from ThemeForest”.
So if you need support for plugins you need buy them.
Please contact the plugin author http://codecanyon.net/item/wordpress-live-chat-plugin/3952877 concerning your issue.
