I am fairly competent with computers, but I've run into a problem that has me completely stumped. I have an Nvidia Quadro K1200 graphics card in my Mac Pro tower. I have used the Nvidia drivers with no problems, up until a few weeks ago, when Apple released the security update for OS X 10.11. When I tried installing the new driver, it gave me an error. I have now gotten this error in both OS X 10.11 and macOS 10.12, with both driver versions 346.03.15f03 and 367.15.10.05f01. The error appears after running through the whole install dialogue: Now, I looked at the logs in the Console and it appears to be some kind of SandboxViolation or System Policy error. Here is the list of errors that occurred during the installation: I can add the full text of the errors if that would be helpful, but I'm wondering if anyone has any ideas of what the problem is and how to fix it.