#Ccant disable gatekeeper mac os sierra mac#

If you've downloaded an app and the Mac won't let you open it, follow these steps. You can also open apps from unidentified developers in the Finder.

Click the lock when you're done to save changes and prevent any more changes from being made.

Change the setting to Mac App Store, Mac App Store and identified developers, or Anywhere.

If you want to change those settings, click on the lock icon you see in the lower left hand corner of the Security & Privacy window.

The setting that says 'Allow applications downloaded from' are the Gatekeeper settings.

Security & Privacy shows your Mac's security settings.

Gatekeeper is there to stop malware from getting on your Mac, and that's a good thing. You can shut off this protection, though I wouldn't recommend it. This was the first time Apple offered Gatekeeper, and its default setting is 'Anywhere.') If you try to change the setting to 'Anywhere', the Mac will warn you against it (though it will make the change if you tell it to.)

The default setting for Gatekeeper on most Macs is 'Mac App Store and identified developers.' (The exception is OS X Lion 10.7.5. Gatekeeper checks for the presence of a digital certificate embedded in the app itself that tells the Mac the app is from a signed developer who has registered with Apple. Given that reality, Gatekeeper helps OS X makes sure that app is safe to run, even if it's not from the Mac App Store.