>Currently, CleanMyMac 3 is not compatible with the latest OS X 10.11 El Capitan as it is in Developer Preview status. Apple has recently released this operating system and we haven't had the chance to test it yet.
>Please rest assured that our developers are aware of this, and that they are working on an update. In near future, you’ll be able to use CleanMyMac 3 on OS X 10.11 El Capitan. Please note that while this version of Mac OS X is in Developer Prieview or Beta Status, all cleaning should be preformed at your own risk.