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“[Name] is an application downloaded from the Internet. Are you sure you want to open it? “
Starting with newer versions of Mac OS X, you may find that when you download a file from the web and go to open it, you’ll be prompted to say something along these lines, warning that the app has been downloaded from the Internet and asking for confirmation if you really want to open it or not.
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Gatekeeper is a security feature of the macOS operating system by Apple. It enforces code signing and verifies downloaded applications before allowing them to run, thereby reducing the likelihood of inadvertently executing malware. Gatekeeper builds upon File Quarantine, which was introduced in Mac OS X Leopard and expanded in Mac OS X Snow.
This is Mac OS X only secure, which is usually a good thing for most users, but if you always know for sure what you’re downloading, it may even be too secure. For users who want to stop those messages, you can disable the warning dialog box by accessing the command line and the default character string. We’ll show you how to disable (and re-enable) this if you don’t want that message to appear.
Disable warning for an application downloaded from the Internet in OS X and default scripting
To disable this quarantine message, start your Mac terminal and type the following command:
defaults type com.apple.LaunchServices LSQuarantine -bool NO
You will then need to restart (although killing the Finder should work as well) for the changes to take effect.
This has changed from time to time since it was deployed on OS X Leopard through Snow Leopard, Mountain Lion, and Mavericks. Even OS X Yosemite includes a warning, although modern versions of OS X make it easier to change warnings simply by going through GateKeeper in Mac’s Security preferences panel.
Using Gatekeeper can also bypass these one-time notifications from applications.
Re-enable the file download quarantine warning in OS X using default typing
To reverse this and get the file quarantine message back, type:
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defaults type com.apple.LaunchServices LSQuarantine -bool YES
Again, you need to restart (or kill the Finder) to get the changes back.
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