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Gatekeeper options set to "Mac App Store and identified developers""App name" can't be opened because it is from an unidentified developerYour security preferences allow installation of only apps from the Mac App Store and Identified developers.Safari downloaded this file Date from URL.
For apps that are downloaded from places other than the Mac App Store, developers can get a unique Developer ID from Apple and use it to digitally sign their apps. The Developer ID allows Gatekeeper to block apps created by malware developers and verify that apps haven't been tampered with since they were signed. If an app was developed by an unknown developer—one with no Developer ID—or tampered with, Gatekeeper can block the app from being installed.Note: If you have an app that has not been signed with a Developer ID to support Gatekeeper, contact the developer of the app to determine if they offer an update which supports Gatekeeper.