This is NOT an regular app, but just an donation package which activatessome experimental features in the free Greenify app. It will not work until you explicitly enable them from the main menu of Greenify.
For Android 4.3, please install the beta version of new Xposed framework:
http://forum.xda-developers.com/showpost.php?p=44979780&postcount=3003...

[SAMSUNG/SHV-E300S; 2.2.1/E300SKSUAMH2/4.2.2]