You need NGUI to use this plugin
When focused on programming in Unity, the last thing you want to do is waste time trying to organize and adjust your GUI to match as it was already planned in photoshop by your artists. With FastGUI you won't have to, because all that time-consuming process is entirely automatized. With only 2 simple commands your Photoshop file will be perfectly set up inside Unity, allowing you to focus on what really matters: making your app/game!