DJM S9 Driver issue

Hi I just purchase a S9 I updated the firmware 1.9 I downloaded driver 1.0.1 , 1.1.2 and 1.2.0 uninstall restarted Mac book after each one and installed a new one, but I keep getting an error message “ system extensions cannot be used.... system library extensions DJM S9 usbaudio.kext was install improperly Contact vendor” I’m on a Mac OS El-captain 10.11 I allowed/unlocked security in “security & privacy” I delete all third-party midi drivers Any help or little/major detail I may have over looked