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Like Any Video Converter Free, MacX YouTube Downloader is a cut down not- downloading being a bit of a problem for a downloading app.

Fix the “App can’t be opened because it is from an unidentified developer” Error in Mac OS X

If you trust the developer, you can tell your Mac to open it anyway. Only run apps you trust.


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This is the best, most secure way to run a handful of unsigned apps. In macOS You can no longer disable Gatekeeper entirely from the System Preferences window.

Mac OS: App can't be opened from unidentified developer!

First, open a Terminal window. Apple is trying to make macOS more secure by hiding this option from less knowledgeable users. The Best Tech Newsletter Anywhere.

macOS Sierra: Open an app from an unidentified developer

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  • How Gatekeeper Works.
  • Fix the “App can’t be opened because it is from an unidentified developer” Error in Mac OS X.
  • Mac OS X - Install Programs from Unidentified Developers?

In the meantime, Users can follow the directions below to prevent this error message from appearing. Open the System Preferences. If the lock icon at lower left is "locked", click the icon labeled Click the lock to make changes. Exit System Preferences by clicking the red button in the upper left of the window.

Mac OS X - Install Programs from Unidentified Developers

Once the developer has corrected their "identy" issue, be sure to revert changes made above, and once again allow only "applications downloaded from Mac App Store and identified developers". For more information about this issue, please visit Apple's KB article on the topic: As a result, users may be unable to install or run some applications downloaded from the internet or stored on physical media, and the error below is displayed: