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1. In Mac OS X Mountain Lion and later versions, the user has an option if they want to install apps from unidentified developer. This is good because there are many unidentified applications that you can download online and you know it is safe even if it is not caming from Mac App Store.
2. Mac OS X - Install Programs from Unidentified Developers. Users who do not want to change the global. Can't be opened security preferences third 3rd party.
3. As of OS X 10.8 (Mountain Lion) Apple changed the default security settings to only allow installation of apps from the Mac App Store and identified developers.
4. Oct 04, 2019  With this change, Gatekeeper no longer monitors your computer for malware coming from apps and files. Restoring to the original setting. If you'd like to return to the default Gatekeeper settings, perform these steps: Be sure to exit System Preferences on your Mac. On Finder, click Go. Select Utilities. Double-click Terminal.

1. How To Change Security Preferences On Mac To Allow Unidentified Developer
2. How To Change Security Preferences On Mac For Unidentified Developer Sierra
3. How To Change Security Preferences On Mac To Allow Installation Of Unidentified Developers

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

In Security and Privacy window, here you can change the settings of your Mac if you want to install apps from unidentified developer, To make the changes, click the padlock icon at the bottom-left corner of the window. To confirm provide your name and password in the popup window. See the screenshot.

How To Change Security Preferences On Mac To Allow Unidentified Developer

Background:

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.

How To Change Security Preferences On Mac For Unidentified Developer Sierra

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.

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

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:

How To Change Security Preferences On Mac To Allow Installation Of 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.

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