A Word About El Capitan In Beta
As I pointed out last year when the first Yosemite beta was released:
I make no guarantees as to the reliablity of any software authored by me when operated under a pre-official-release beta version of the operating system.
10.11/El Capitan-compatible software will be clearly labeled as such if and when it is actually compatible. Otherwise, don't presume any script or app is compatible with El Capitan at all until the official release date in the Fall.