Colorbox style after upgrading to Premium

So I purchased the plugin’s premium version thinking the colorbox style would be changed to the same that appears in the demo (http://plugins.yithemes.com/yith-woocommerce-compare/?preview), but it’s still using the same style as the free version.

How am I supposed to change the colorbox theme? Dequeue the plugin styles and manually add my own?

https://wordpress.org/plugins/yith-woocommerce-compare/