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Click the lock icon in the corner and authenticate with an admin account login and password on the Mac.Pull down the  Apple menu and choose “System Preferences”.To fix the “App.app can’t be opened because it was not downloaded from the App Store.” error messages on Mac, you must go to System Preferences and adjust your Mac security settings. How to Fix “Mac app can’t be opened because its was not downloaded from the App Store” Error Messages But what if you want to open the app? That’s what we’re covering, and you’ll see it’s quite simple.

Below that warning also states “Your security preferences allow installation of only apps from the App Store.” and the error message dialog box also shows when and where the file was downloaded from, with two options, choosing OK or to Show in Finder.