Follow steps below to disable SIP (System Integrity Protection which stops installing driver) before install.
- Reboot the Mac and hold down Command + R keys simultaneously after you hear the startup chime, this will boot OS X into Recovery Mode.
- When the “OS X Utilities” screen appears, click on “Utilities” menu at the top of the screen, and choose “Terminal.”
- Type the following command into the Terminal then hit return:
csrutil disable; reboot
- Your computer will restart immediately
Then you can install Aobo filter. If you installed it before, try to Uninstall it and then reinstall it.
On Mac OS 10.3.x and above, approve the driver loading if there is a popup reminding you to approve the driver kext.