@andre4stein, all I can think about is entering in a terminal : "sudo nvram boot-args=“rootless=0” which disables system protection on 10.11, then reboot and try.
Set it to 1 to enable again if it does not matter.
Edit: @andre4stein I assume you have 8.0.30? I can run it on 10.11.1 but it’s the pro version.