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- Sep 22, 2016.
Since the launch of macOS Sierra in 2016, Apple has tightened up the Gatekeeper security. One very visible change thanks to this is the option to allow apps from ‘unidentified developers’ missing from settings. This tight security causes some apps downloaded from sources other than App Store to show ‘this app is damaged’ or ‘this app can’t be opened because it’s from an unidentified developer’ message.
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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. You could simply change this to ‘Anywhere’ and run any app on your Mac. In macOS versions since Sierra, Apple no longer provides this option in Settings by default. https://ameblo.jp/tichanmyagin1987/entry-12639676909.html. But there’s still a way to bypass Gatekeeper, add ‘Anywhere’ option back to Settings, and solve ‘this app is damaged’ error.
Now, ‘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. Basically Apple wants to ‘allow’ apps from App Store only. And it’s worth mentioning that you should only run third-party apps from developers you trust. If the app you wish to use isn’t available on App Store (like VLC media player and 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
To solve ‘this app is damaged’ error, simply open Terminal from Launchpad and enter the following command.
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.
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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).
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 on techstuffer.com. I hope you found this tutorial worth your time and I’d like to thank you for reading.
Check compatibility
You can upgrade to macOS High Sierra from OS X Mountain Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 14.3GB of available storage space.
MacBook introduced in late 2009 or later
MacBook Air introduced in late 2010 or later
MacBook Pro introduced in mid 2010 or later
Mac mini introduced in mid 2010 or later
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MacBook Air introduced in late 2010 or later
MacBook Pro introduced in mid 2010 or later
Mac mini introduced in mid 2010 or later
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To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS High Sierra, the installer will let you know.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download macOS High Sierra
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.
If you still need macOS High Sierra, use this App Store link: Get macOS High Sierra.
Begin installation
After downloading, the installer opens automatically.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
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If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. https://everkiss412.weebly.com/x-plane-7-mac-download.html. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
Learn more
- If you have hardware or software that isn't compatible with High Sierra, you might be able to install an earlier macOS, such as Sierra or El Capitan.
- macOS High Sierra won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
- You can use macOS Recovery to reinstall macOS.