How to fix “Can’t be opened because it is from an unidentified developer” on MacOS


Since MacOS X Mountain Lion version, Mac users will no longer be able to run apps from a developer that was not certificated by Apple. And you will usually receive a message notification, saying that “[App_name] can’t be opened because it is from an unidentified developer” when launching that app. So, to help you get rid of this problem, this short article will show you a tip to fix “Can’t be opened because it is from an unidentified developer” warning message on your MacOS.

In fact, it’s a feature that has already been added into MacOS X Lion version, which is called GateKeeper. However, it’s not a feature that does not allow you to run an app from an untrusted developer.  All you need is to stop GateKeeper from checking apps or temporarily disable it.

Ignore “App Can’t Be Opened” Notification

It’s the best option for Mac newbies since it does not affect your computer system and keep your system secure. To temporarily disable the “App Can’t Be Opened” notification for all apps, simply follow these steps below:

  • Right-click (or press Control + left click) on the app, coming with the notification and choose “Open”
  • Continue to click on “Open” box to run the app

If you feel annoyed with opening the app by doing this way, you can then disable GateKeeper so that you longer receive the notification.

Completely toggle off GateKeeper

This method is recommended for those who have been using Mac for a long time, and know exactly whether it’s a trusted app or not.

  • Click on Apple icon and go to System Preferences
  • Select “Security & Privacy” and click on General tab
  • Hover your mouse/ touchpad to the yellow clock icon and enter your password to grant permission to change attributes.

  • Find “Allow applications downloaded from” section, select Anywhere and agree with the warning message.

That’s all! You can now run any untrusted apps from any developers. If you feel this post useful, let’s know in the comment below.



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