You can Uninstall the lite version if you want to. However, we recommend keeping. It's a fallback method. We have decided that all pro users must install the lite version as well. The reason because in some cases or in the future, let's say you decided not to use the pro version or something happen to the pro version. You always have the lite version to support and backup you, so that your site won't mess up showing a butch of shortcode and etc on frontend.
We care about your sites and that is why we added a fallback method for our pro users.
Also, we've enhanced and make sure when both the free and pro version installed and activated together, only the pro version functions, script and files will be loaded. There won't be any extra files or functions loaded when both are activated.
Let us know If you've any question or need any help: http://divisupreme.com/contact