Home → CLC FAQ - Basics: Installation, data, system resources → Installation and upgrades → What does it mean if a Mac installer says it 'is damaged and can't be opened'?
- Fix Damaged App Message Macos Sierra Download Free Windows 10
- Fix Damaged App Message Macos Sierra Download Free Version
'This copy of the macOS high sierra application is damaged - Can't be used to install macOS'. Donate to support me: Fix this.
If you are working on Mac OS X 10.9.2 or newer, you may see a message about a software installer being damaged when you try to launch it. e.g. saying the software 'is damaged and can't be opened. You should eject the disk image' or that the software 'is damaged and can't be opened. You should move it to the Trash.'
Newer Mac systems include a security setting that can block the installation of apps downloaded from places other than the Mac App Store. To install QIAGEN software, you need to allow apps downloaded from identified developers as well the Mac App Store. Do this by adjusting your security settings:
How to fix damaged app message on macOS Sierra or later. To resolve 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. I have tried multiple times (22) to download High Sierra but every time i get message that ' This copy of the Install macOS High 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. 11' 2013 MacBook Air (top specs, 8gd Ram, 512gb hard drive, 1.7ghz i7). How to fix damaged App message on MacOS Sierra 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.
- Go to System Preferences | Security & Privacy
- Click on the padlock icon at the lower-left corner to enable you to make changes.
- Choose 'App Store and identified developers'
We sign our software with a Developer ID from Apple. With the above setting chosen, you should be able to install our software. You will see a message warning you that the software has been downloaded from the internet, and asking if you wish to open it. This is expected, and you can proceed with installing the software.
Security settings affect your whole system. If you generally do not want to allow apps downloaded from anywhere except the App Store, then change the security settings back to the desired setting after you have finished installing your QIAGEN software.
If you continue to see this issue with the 'Allow apps downloaded from' option set to 'App Store and identified developers', please report this problem by emailing [email protected] Please include the full name of the installer, when you downloaded it and the URL of the page you visited to download it from.
If you wish to proceed with installation anyway
If you are certain you obtained the installer via official channels and thus wish to proceed with installation anyway, information on how to do so is below.
Mac OS X 10.9.2 to 10.11.x
In Mac OS X 10.9.2 and newer, there is a security setting that must be changed so that the downloaded installer can be opened. To change this setting on Mac 10.9.2 through 10.11.x, please take the following steps:
- Go to System Preferences | Security & Privacy
- Click on the padlock icon at the lower-left corner to to enable you to make changes.
- Select the option for Allow apps downloaded from: to Anywhere
- Close the security settings window
- Double click on the installer file again and click the Open button when prompted.
We recommend reverting your security settings after installation of the software is complete.
Mac OS Sierra 10.12.x
The premise is the same as shown for Mac OS 10.9.2 through 10.11.x except that the steps to enable the 'Anywhere' option are different.
If you view your security settings under System Preferences | Security & Privacy, you will see there is no Anywhere option.
To enable the 'Anywhere' option, run the following command in a terminal: Aerofly rc 7 0 7 – rc flight simulator.
If you go back to System Preferences | Security & Privacy, you will see the Anywhere option enabled. Unlock the edit option by clicking on the padlock icon at the bottom of the window to change to Anywhere option.
![Fix damaged app message macos sierra download free version Fix damaged app message macos sierra download free version](https://worldofmac.net/wp-content/uploads/2018/07/maxresdefault-1-830x467.jpg)
At this point, you should be able to install the software.
This security setting affects your whole system. To reinstate the earlier security policy, run the following after the software is installed:
and then check your security settings are as you expect.
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Fix Damaged App Message Macos Sierra Download Free Windows 10
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.
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. 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
![Download Download](https://miro.medium.com/max/960/0*VrjxS458AaL-ScDG.jpg)
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’).
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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.
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