Full Details here:
https://uruploads.com/blogs/fix-the-app-cant-be-opened-because-it-is-from-an-unidentified-developer-on-mac/

Mac OS defaults to preventing applications from unidentified developers or sources from being launched. You’ll discover the message in OS when you try to launch a Mac app that didn’t come from a verified source or from the Mac App Store, and you’ll get an alert dialog that says “[App name] can’t be opened because it is from an unidentified developer”.

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Safely open apps on your Mac
macOS includes a technology called Gatekeeper, that's designed to ensure that only trusted software runs on your Mac.

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