Get Bartender working on El Capitan (15A204h)

Out of the box so to speak Bartender doesn't hide the system menu bar icons on 15A204h but with a bit of searching I found that running ‘sudo nvram boot-args=”rootless=0”’ (without the beginning and end quotes) followed by a reboot, which disables rootless on El Cap solves this issue. To revert and re-enable rootless, you can run ‘sudo nvram boot-args=”rootless=1”’ followed by a reboot, but that breaks bartender so thats not a good idea as you came here to fix it in the first place.

bartender working on El Cap 15A204h