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If an app is not from the Mac App Store
If you see a dialogue stating “The app is not from the Mac App Store”, the app you tried to open wasn’t downloaded from the Mac App Store.
You can change your settings to allow apps from known developers.
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)Go to Security, click the pop-up menu next to “Allow applications from”, then choose App Store & Known Developers.
If you’re still unable to open the app, see Open an app by overriding security settings.