You have to uninstall your old app and replace them with these new apps in order for them to work.
Updated the XDA App on account of it not working. Sorry for the inconvenience. For some reason it wont show up in the Multi_Window list, but it will still do Multi_Window.
So I FINALLY made a video on how to do this yourself http://www.youtube.com/watch?v=8kiP9...YLZQOTbC9WeWSQ
Box Folder: https://www.box.com/s/qag83p31eyp5np81y59j