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How to open an app from an unidentified developer and exempt it from Gatekeeper

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Gatekeeper helps protect your Mac from apps that could adversely affect it.


 

If you are confident the app downloaded from the Internet is the latest version and is from a source you trust, you can open an app from an unidentified developer by following these steps.

 

  1. In Finder, Control-click or right click the icon of the app.
  2. Select Open from the top of contextual menu that appears.
  3. Click Open in the dialog box. If prompted, enter an administrator name and password.

 

refrence: https://support.apple.com/en-us/HT202491