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Unfortunately in the past there have been apps that slipped through this process because a certificate was present, such as the case of the Shlayer malware, but Apple has ramped up security since and changes to notarized apps are pushed out as required. If you choose to allow installations from identified developers then Apple will look for evidence that the app is notarized and it will also verify that the app hasn’t been tampered with and no malware is present. If you prefer to allow installations from outside the Mac App Store follow the same steps but choose App Store and identified developers from the options.

Under Allow applications downloaded from select App Store.

Scroll down to Security and select App Store below Allow applications downloaded from.

If you want to make sure your Mac can only install apps from the Mac App Store these are the steps to follow: If you only install apps from the Mac App Store, or notarised apps from identified developers, you should be safe, but sticking to the Mac App Store is the safest option as apps on the Mac App Store can’t be tampered with.

As long as the app has passed Apple’s tests it will have a Notarisation ticket, which Gatekeeper looks for before telling macOS that it is safe to open. An identified developer is one whose software has been scanned by Apple to ensure it is safe. Mac users can choose to only install apps from the Mac App Store, which is the safest option as it mean that the app has been thoroughly checked by Apple before being distributed.Īlternatively there is an option to install apps from the Mac App Store and from identified developers. Apple makes it hard to install an app that might not be safe on a Mac.