Nope, it’s not a paid feature, you already have the premium version.
Try this for me please
Go the Revolutions Slider Admin page
and open the browser’s inspector “developer tools” http://devtoolsecrets.com/secret/general-finding-the-development-tools.html
and check for errors when you click on a menu item
Also please try again after deactivating all plugins except Revolution Slider
Let me know how it goes