Wordpress Paywall Modification -- 3

A paywall serves to restrict access to a certain type of content, forcing users to register/pay first before they can open the content. I need you to help me modify a paywall plugin, called Leaky Paywall(website: [login to view URL] plugin url: [login to view URL]), so that it: can restrict audio/video files, no longer requires me to pay monthly license fees for one of its add-ons, and it integrates with Erphdown, which is another plugin that enables my website to create a VIP user category. In total there are three tasks that need to be done, please examine the attached Task Description carefully to better understand what needs to be done