Several users have reported that they receive the error message below when they attempt to upgrade to macOS Catalina.

Error Message: This copy of the Install macOS Catalina application is damaged, and can’t be used to install macOS.

Are you having this problem? This article explains how you can fix this macOS application damaged error.

Fix corrupt Mac App Store downloads. Sometimes the Mac App Store caches a corrupt installer, which can cause persistent verification errors. But there's an easy way to fix it. Uninstalling an app on a Mac is so easy, you might not even realize how to do it: just drag the app’s icon from the Applications folder into the trash. But what about applications that don’t have shortcuts, built-in system apps, and other corner cases?

Please try each step one at a time until you resolve your issue.

1. Please make sure that you are trying to update to macOS Catalina by going to Apple Menu > System Preferences > Software Update. Do not use any other non-Apple source, such as a third party web site.

2. Delete the damaged macOS version and retry to download again. The copy of the damaged file is located in /Applications folder. You can also use the Terminal to do this. Here is how:

• Open the Terminal app (Applications > Utilities) (you can use Spotlight)
• Copy and paste the following command

• Press enter, you may have to enter your admin password

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This will delete the app, now you need to re-download and install Catalina. Simply click the Upgrade Now button.

Experiencing a problem with several apps after installing macOS Catalina. When the app is downloaded from the internet I get the error: 'APP NAME' is damaged and can't be opened. You should move it to the trash. Any workarounds to bypass macOS gatekeeper for specific apps? For Mac OS X 10.11 or later read this. Damaged app message. 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 you are trying to install App or Game from outside the AppStore. Any way to solve this follow these instructions: Open your System Preferences.

How To Open A Damaged App On Mac Computer

3. Try removing installinfo.plist. Here is how:

Note: This also works when a Mac App Store app is reported as being damaged for other reasons. How to fix a damaged app that won't open on the Mac. Reboot your Mac. Open your Applications folder either by using the Finder or searching in Spotlight. Find the damaged app and delete it. Enter your Mac user password to authorize deletion, if requested. 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. 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. While leaving Gatekeeper turned off could leave your Mac open to risks, there’s another way to open unverified or ‘damaged’ apps. This approach involves adding the app in question to an ‘allow’ list or exempting it from further scrutiny. /blu-ray-mac-app.html.

• Open Terminal and enter the followign command and press enter:

Need New App To Open

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4. If still having this issue, this may be due to the invalid time on your Mac. You may have to correct this. Here is how:

How To Open A Damaged App On Mac Os

• On your Mac, go to System Preferences > Date & Time. Is this showing the correct time and date? If not change it. And check the “set date and time automatically” box. Close this and retry again.
• If you are stuck before the OS installed (you are unable to access System Preferences), and then you may try the Terminal app to do this. Here is how:
  • Click the Utilities menu (from the macOS Utilities menu) and select Terminal
  • Enter the following command and hit enter
  • date
  • Is it the correct info? If not, change please by using the date {month}{day}{hour}{minute}{year} format. Brackets should be replaced with a two-digit number such as October 8, 2019 11:36 Am (today’s date and current time) would become date 1008113619
  • Type this and press enter
  • Now quit Terminal and try downloading Catalina again.

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See also: Apple ID Settings problem