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You can't turn off SIP on a running macOS system. You need to boot into the Recovery partition and run the csrutil command. This page at Macworld details the steps nicely.


Restart your Mac.

Before OS X starts up, hold down Command-R and keep it held down until you see an Apple icon and a progress bar. Release. This boots you into Recovery.

From the Utilities menu, select Terminal. At the prompt type exactly the following and then press Return: csrutil disable

Terminal should display a message that SIP was disabled.

From the  menu, select Restart.



You can re-enable SIP by following the above steps, but using csrutil enable instead.