Jan 13, 2016  On the 'General' tab, change the 'Allow Apps Downloaded From' setting to: 'Anywhere'. Click the 'Lock' to save changes. Unfortunately this resolution doesn't work for OSX 10.15 or above, as the security and preferences options have changed between OS versions. Apple helps you keep your Mac secure with software updates. The best way to keep your Mac secure is to run the latest software. When new updates are available, macOS sends you a notification — or you can opt in to have updates installed automatically when your Mac is not in use. MacOS checks for new updates every day, so it’s easy to always have the latest and safest version. Apr 15, 2020  To remove and reinstall apps from your Mac: Open Launchpad then click and hold any app. Click the X button to uninstall apps you got from the Mac App Store. There are numerous stock Apple apps you can’t uninstall. For apps you downloaded elsewhere.

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

How To Change Security Preferences For Apps On Mac

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:

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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.

Changing Security Preferences On Mac

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

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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.

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:

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