• Allow Apps From Unidentified Developers
• Mac Cannot Install Software Unidentified Developers
• Mac Unidentified Developer Allow

Apr 07, 2017  If you try opening an unsigned app by double-clicking it, it won’t work. You’ll see an “App Name can’t be opened because it is from an unidentified developer” message. Of course, there may be a time when you come upon an unsigned app that you need to use. If you trust the developer, you can tell your Mac to open it anyway.

This document describes how to enable installation of applications from sources other than the Mac App Store on macOS.

Background:

Allow Apps From Unidentified Developers

By default, Mac OS only allows users to install applications from 'verified sources.' In effect, this means that users are unable to install most applications downloaded from the internet or stored on physical media without receiving the error message below:

Users can follow the directions below to prevent this error message from appearing in one of two ways:

• Changing Gatekeeper's settings (10.8.x / 10.9.x / 10.10.x / 10.11.x)—this is useful for users who download a lot of programs that are not from 'verified sources.'
• Changing Gatekeeper's settings (10.12.x / 10.13.x)—the same steps as above, but for Mac's Sierra and High Sierra OS
• Manually allowing individual applications to launch—this is the best method for users who do not want to change the global setting to allow all applications to run.

For more information about this message, please visit Apple's KB article on the topic: http://support.apple.com/kb/HT5290.

Change Gatekeeper Settings (10.8.x / 10.9.x / 10.10.x / 10.11.x):

1. Open the System Preferences. This can be done by either clicking on the System Preferences icon in the Dock or by going to Apple Menu > System Preferences.

2. Open the Security & Privacy pane by clicking Security & Privacy.

3. Make sure that the General tab is selected. Click the icon labeled Click the lock to make changes.

4. Enter your username and password into the prompt that appears and click Unlock.

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5. Under the section labeled Allow applications downloaded from:, select Anywhere. On the prompt that appears, click Allow From Anywhere.

   Note: In Max OSX 10.12 Sierra and 10.13 High Sierra, the 'Anywhere' option does not appear. In these cases you will need to follow the instructions below for manually launching the application

6. Exit System Preferences by clicking the red button in the upper left of the window. You should now be able to install applications downloaded from the internet.

To Manually Launch Application:

Mac Cannot Install Software Unidentified Developers

1. While holding down the control key on your keyboard, click the application's icon once to make a dropdown menu appear.

2. Select Open from the menu. A new window will appear.

3. Click Open in that window to launch the application. You should only need to do this once per application, on the first launch. After that, you'll be able to launch the application any way you like.

Mac Unidentified Developer Allow

Change Gatekeeper Settings (10.12.x / 10.13.x):

• For OSX Sierra, we recommend consulting Apple's documentation at the following link: macOS Sierra: Open an app from an unidentified developer