Hello, 
Per your webpage, https://themeforest.net/item/materialize-material-design-multipurpose-wordpress-theme/19655492, the Slider Revolution was included with the $59.00 Materialize theme purchase. Yet when I attempt to use one of the templates, I am prompted for a code. I did not receive one specifically for the Revolution Slider as a part of the download. How do I go about using this part of the plugin? I decided to purchase this theme because of the additional features it offers. I sincerely hope I don’t have to pay for premium use of this plug in on top of the money I spent on the theme. 
I would appreciate your help. 
Laurie