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

Temporarily Get Around “App Can’t Be Opened” Gatekeeper Alert Message

This is probably the best option for most users, since it maintains some security:

  1. Right-click (or control-click) the application in question and choose “Open”
  2. Click the “Open” button at the next dialog warning to launch the app anyway

You can do this with any third party app that gives you this warning dialog and open it anyway.

Disable GateKeeper’s Unidentified App Developer Prevention Completely

This is generally best for advanced users who know what apps to trust and not to trust:

  1. Launch System Preferences from the Apple  menu
  2. Choose “Security & Privacy” and then click the “General” tab, followed by clicking the lock icon in the corner to unlock the settings
  3. Look for “Allow applications downloaded from:” and choose “Anywhere”
  4. Accept the security warning and allow
  5. You can now launch any app from any location or developer
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