Since the launch of macOS Sierra in 2016, Apple has tightened up the Gatekeeper security one very visible change thanks to this the option to allow apps from unidentified developers is no longer there.

1. Fix Damaged App Message Sierra Download
2. Fix Damaged App Message Sierra Vista
3. Fix Damaged App Message Sierra 10
4. How To Fix Damaged App Message On Macos High Sierra

This tight security causes some apps downloaded from sources other than the App Store to show ‘this app is damaged’ message. Another error you might see is ‘this app can’t be opened because it’s from an unidentified developer.’

Sep 21, 2016  This copy of the Install macOS Sierra.app application is damaged, and can't be used to install macOS. I have validated that i have enough RAM and diskspace when download happens. More than 3 GB RAM and 35 GB disk space is available.

Previously, you could simply change a setting and allow any app to run on your Mac. In macOS versions since Sierra (macOS Mohave and macOS Catalina), Apple no longer provides this option in Settings by default. But there’s still a way to bypass Gatekeeper and solve ‘this app is damaged’ error.

A Little Flashback

• Jan 28, 2020  For Yosemite and below. Shut down your computer. Press Command+R. Press the power button. Hold Command+R until you hear the startup chime or see apple logo and progress bar. Select Disk Utility. Select Disk Verify Permissions. After verify, choose Repair Disk Permission.
• Dec 02, 2019  Being tested with more than 10,000 video files, Aimersoft Video Converter is assured the fastest video converter for Mac and Windows, which runs an unbeatable 90X faster conversion speed than contemporaries.

In previous versions of Mac OS X (now simply macOS), there used to be three options under Settings > Security & Privacy > General. The “Allow apps downloaded from:” area had options, namely: App Store, App store and identified developers, and Anywhere.

As the last option is now missing from settings, you’ll need to run a command in Terminal to loosen up Gatekeeper security of macOS. This will add the ‘Anywhere’ option back to where it used to be — allowing you to run apps downloaded from the internet.

Caution: The ‘This App Is Damaged’ message is not really an ‘error.’ It’s a ‘security feature’ designed to keep your Mac from running unauthorised apps that can possibly contain malware.

Fix Damaged App Message Sierra Download

You should only allow third-party apps from developers you trust to run on your Mac. Mac App Store is the best way to download apps. If the app you wish to use isn’t available on App Store (like VLC media player or Skype), proceed with caution and only download it from the official website of that app.

How to Solve ‘This App Is Damaged’ Error in macOS Catalina, Mohave or Sierra?

To solve ‘this app is damaged’ error, simply open Terminal from Launchpad and enter the following command.

Fix Damaged App Message Sierra Vista

sudo spctl --master-disable

Enter your password and you’re done. Note that there are two (2) dashes before master. You might miss that while copy/pasting. So I will leave a screenshot below. I would suggest you type the command manually.

Also note that there is no output or message after you successfully execute the command. Open Settings and verify that the Anywhere option is now visible as shown below.

After this, you can install and run any app that gave you error and now you’d be asked if you wanted to run that app. Click Open and the app should load just fine — like it’s supposed to.

Reverting the Gatekeeper Settings

Once you disable Gatekeeper and run app(s) you want, you should change the security settings back to normal. Leaving Gatekeeper security turned off leaves the ‘gate’ open for other unauthorized apps as well and it’s recommended that you leave Gatekeeper on.

To enable Gatekeeper again, enter the following command (notice two dashes before ‘master’).

sudo spctl --master-enable

That’s it. You’ve reverted to default security settings. After this, you will still be able to run the app(s) that previously gave you error. If you install a new app after turning on Gatekeeper, you will have to turn it off again in order to run the new app(s).

Fix Damaged App Message Sierra 10

Note that you should run all those apps which you couldn’t run at least once after disabling Gatekeeper, otherwise you won’t be able to run them after enabling it again.

That’s it folks. You were reading How to Solve ‘This App Is Damaged’ Error in macOS Sierra on techstuffer.com. I hope you found this tutorial worth your time and I’d like to thank you for reading.

To resolute Gatekeeper issues on macOS Sierra and unlock images and programs ( annoying image/application is damaged messages pretending you cannot open things ).

For that reason you might have to completely disable Gatekeeper checks, and to do that open your terminal and type:

sudo spctl --master-disable

Your mac password will be required.

For Mac OS X 10.11 or later:

Most of new to Mac users don’t know about this and always ask what to do, the message above or the damaged app message appears when your are trying to install App or Game from outside the AppStore.

Any way to solve this follow these instructions :

1- Open your System Preferences.

2- Click on Security & Privacy.

3- Then on the General tab “Click on the lock to make changes”

4- Then under the “Allow applications downloaded from:” >>>> Click on “Anywhere”

How To Fix Damaged App Message On Macos High Sierra

5- Done!!