Integrating the Download Plugin within Wordpress

Hi friends, I have a pro version of Download manager plugin. It has features to upload files with a feature of custom post type. Now I want to integrate all the plugin features within wordpress so that i everything is present in the wordpress itself. This job would require the following : 1. Integrating the plugin functions into wordpress and including those functions in the add post page. 2. Adding all features which the plugin has. 3. You can do it either default post type else you can create your own custom post type. I have attached the plugin. You can see what features the plugin supports and can you be able to integrate it within wordpress without the need of wordpress. regards, Rias