I used the Zenfone quick root file for the zf2. You can get it from here: forum.xda-developers.com/zenf...one-2-t3114063 Its ment for the zf2 but it still worked for the zf2e.
Just like Taco_MAN545 said, the ZenFone 2 One Click Method works as well for the 2E, that's what I used.
Although, the bootloader, ROMs, and Kernels will not work.