To fix a Mac app is damaged and can’t be opened error, first delete the affected app and download a fresh copy from the Mac App Store or the developer’s official website. Then update macOS and the app, restart your Mac, and try opening it again. If macOS shows an unidentified-developer or verification warning instead, check System Settings > Privacy & Security for the appropriate security option. Only bypass macOS security protections when you completely trust the app and its source.
Few Mac errors are more frustrating than downloading an application, trying to open it, and suddenly seeing a message saying “The application can’t be opened” because it is damaged.
If you see a Mac app is damaged and can’t be opened error, macOS may have detected a corrupted, modified, incorrectly signed, or incompatible application. The app may also have failed one of macOS’s built-in security checks.
Fortunately, this does not necessarily mean your Mac has a problem. In many cases, you can fix the issue by downloading a fresh copy, updating the app, checking its security status, or removing a corrupted installation.
This guide explains 9 ways to fix a damaged Mac app that cannot be opened, starting with the safest and simplest solutions before moving into security and compatibility checks.
Why Does My Mac Say an App Is Damaged and Can’t Be Opened?
macOS includes a security system called Gatekeeper, which helps protect your Mac from untrusted software.
When you install an app from outside the Mac App Store, macOS can check its developer signature and, where applicable, its notarization status. These checks help macOS determine whether the application has been altered or contains known malware.
If the app fails these checks, macOS may prevent it from opening.
Think of an application’s digital signature like a tamper-evident seal on a package. If the contents no longer match what the developer originally signed, macOS may refuse to run the app.
Common Causes of the Error
Several issues can trigger a Mac app is damaged and can’t be opened warning:
- An incomplete or corrupted download
- A damaged application bundle
- An outdated version of the app
- An incompatible macOS version
- Changes made to an application after the developer signed it
- A failed application update
- An installer from an unreliable source
- A security verification problem
- Potentially malicious application content
Importantly, “app is damaged” is not always the same warning as “unidentified developer.” The exact message determines which troubleshooting method you should use.
9 Ways to Fix “App Is Damaged and Can’t Be Opened” on Mac
1. Delete the App and Download a Fresh Copy
The first solution is also one of the safest.
A corrupted download can prevent an application from opening correctly. Removing the damaged copy and downloading a fresh version can replace the affected files.
Here’s what to do:
- Open Finder.
- Select Applications from the sidebar.
- Find the application that will not open.
- Right-click it and select Move to Trash.
- Empty the Trash if necessary.
- Download the latest version again.
- Install the application normally.
- Try opening the application.
Whenever possible, download the app from the Mac App Store or directly from the software developer’s official website.
Avoid unknown third-party websites, modified software repositories, and file-sharing platforms.
A fresh download gives you a clean copy of the application and can resolve corruption caused by an incomplete or interrupted download.
2. Restart Your Mac
A simple restart can clear temporary application processes and system issues.
After you delete and reinstall the application, restart your Mac before trying to open it again.
To restart:
- Click the Apple menu.
- Select Restart.
- Wait for your Mac to shut down and start again.
- Open the application.
If the app opens normally after the restart, a temporary macOS process or installation issue may have caused the original problem.
A restart can also help after you install an application update or macOS update.
3. Update macOS
An outdated version of macOS can cause compatibility problems with newer applications.
To check for macOS updates:
- Click the Apple menu.
- Open System Settings.
- Select General.
- Click Software Update.
- Install any available update that works with your Mac.
After macOS installs the update, restart the computer and try opening the application again.
Also check whether the application itself has a newer version.
Pro Tip
If the app stopped working immediately after you upgraded macOS, visit the developer’s official website and check its compatibility information. The developer may have released an updated version for your current macOS release.
4. Update or Reinstall the Application
If your Mac runs the latest compatible version of macOS but the application still refuses to open, check for an application update.
If the app came from the Mac App Store:
- Open the App Store.
- Check for available updates.
- Install the latest version of the affected application.
For apps downloaded directly from a developer, visit the developer’s official website and download the newest version.
If no update exists, uninstall the current version and perform a clean installation.
A clean installation can replace damaged or incomplete files left behind by a failed application update.
5. Check the Exact macOS Security Warning
Before changing any security settings, look carefully at the exact message displayed by your Mac.
Different warnings can point to different problems.
For example, macOS may display:
- “The application is damaged and can’t be opened.”
- “Apple cannot check the app for malicious software.”
- “The developer cannot be verified.”
- “The application was downloaded from the Internet.”
- “The application will damage your computer.”
These messages do not all mean the same thing.
A damaged or modified application may trigger one type of warning, while an app that macOS cannot verify may trigger another. Malware detection can produce an even more serious warning.
Why the Exact Warning Matters
If you mistake an unidentified-developer warning for a damaged-app warning, you might change your security settings unnecessarily.
Identify the exact message first. Then choose the troubleshooting method that matches the warning.
6. Use “Open Anyway” Only When the App Is Trusted
Sometimes users describe an app as “damaged” even though macOS actually reports an unidentified developer or verification problem.
If you completely trust the application and obtained it from a legitimate source, macOS may provide an Open Anyway option.
How to check for Open Anyway:
- Try opening the application first.
- Open Apple menu > System Settings.
- Select Privacy & Security.
- Scroll down to the Security section.
- Look for Open Anyway.
- If you trust the application, select the option.
- Confirm that you want to open the application.
The option may remain available only for a limited period after you attempt to open the app.
Important Security Warning
Do not use Open Anyway simply because a website tells you to.
Overriding macOS security protections can increase your exposure to malware.
Only consider this option when you know the developer, trust the source, and have verified that you downloaded the legitimate application.
7. Reinstall the App From the Applications Folder
A failed installation can leave an incomplete or problematic application bundle.
Remove the problematic copy and install the application again.
After downloading:
- Open Finder.
- Go to Downloads.
- Locate the installer or application.
- Complete the installation according to the developer’s instructions.
- Confirm that the installed application appears in the Applications folder.
- Open the app from Applications.
Do not copy a questionable application from another computer or external drive and assume it will work correctly.
A fresh installation from the developer gives macOS a clean application bundle to verify.
8. Check Whether the App Is Compatible With Your Mac
Compatibility problems can also prevent an application from opening.
This issue can become more noticeable after a macOS upgrade or when you move between Intel and Apple silicon Macs.
Check the application’s system requirements on the developer’s official website.
Look for information about:
- Supported macOS versions
- Intel versus Apple silicon compatibility
- Required system components
- Minimum RAM or storage
- Required permissions
- Supported application versions
If the developer offers a newer version for your Mac, install that version instead of forcing an older release to run.
Why Compatibility Matters
An application can remain intact and still fail to launch when it depends on software components that your version of macOS no longer supports.
In that situation, reinstalling the same old version repeatedly will not necessarily fix the problem.
9. Contact the App Developer if the Error Continues
If you downloaded the latest version from a trusted source, updated macOS, and reinstalled the application but still see the same warning, contact the developer.
Provide the following information:
- The exact error message
- Your macOS version
- Your Mac model
- Whether your Mac uses Apple silicon or Intel
- The affected application’s version
- When the problem started
- Whether the app worked previously
The developer may already know about a signing, compatibility, installer, or notarization problem. They may also have a corrected version available.
Contacting the developer is safer than disabling macOS security features simply to force the application to launch.
What to Do If the Mac App Worked Before but Is Now Damaged
If an application worked normally before but suddenly says it is damaged and can’t be opened, don’t immediately assume that the app has permanent damage.
Think about what changed immediately before the problem appeared.
Check Whether the App Recently Updated
A recent application update may have installed incorrectly or introduced a compatibility problem.
Check the developer’s website for a newer release or reinstall the current version from an official source.
Check Whether macOS Was Recently Updated
If the problem started immediately after a macOS update, check whether the developer supports your current macOS version.
Older applications can stop working correctly when Apple changes system components, security requirements, or compatibility behaviour.
Download the Latest Version
Remove the affected application and download a fresh copy from the Mac App Store or the developer’s official website.
Avoid third-party download sites because the replacement copy could contain the same corruption or modification.
Reinstall the Application
A clean installation can replace damaged or incomplete application files.
After reinstalling, restart your Mac and try opening the application again.
Contact the Developer if the Problem Continues
If the newest version still produces the same warning, contact the application’s developer.
Tell them:
- Your Mac model
- Your macOS version
- The application’s version
- The exact error message
- When the problem started
- Whether the application worked before
This information can help the developer identify compatibility, signing, notarization, or release-specific problems.
The key point: if the application worked before and suddenly became unavailable, check recent app and macOS changes before attempting to disable macOS security protections.
What If “Open Anyway” Doesn’t Appear?
If you expect an Open Anyway button but cannot find it, first attempt to open the application.
Then check:
Apple menu > System Settings > Privacy & Security
Scroll down to the Security section.
macOS associates the Open Anyway option with certain security warnings, including some unidentified-developer or verification situations.
However, if macOS specifically says the application is damaged, do not assume that Open Anyway will solve the problem.
A genuinely damaged or modified app is better replaced with a clean version from a trusted source.
Should You Disable Gatekeeper to Fix a Damaged Mac App?
No—not as a first solution.
Some online tutorials recommend Terminal commands or instructions that disable macOS security protections.
That approach can create unnecessary security risks.
Gatekeeper helps prevent untrusted software from running on your Mac. Keeping these protections enabled and obtaining applications from trusted sources provides a safer approach.
If the application is genuinely damaged, disabling Gatekeeper will not repair it. The change only removes or weakens a security barrier that prevents the application from launching.
A better approach is:
Delete → Download from a trusted source → Reinstall → Update → Verify the warning.
Only investigate a security override when you understand why macOS blocks the application and you completely trust its source.
What If macOS Says the App Will Damage Your Computer?
Take this warning seriously.
macOS treats an application that it identifies as malicious differently from an application that simply appears damaged or modified.
If macOS says an app will damage your computer, do not automatically try to bypass the warning.
When macOS detects malicious content or another serious security issue, it can prevent the application from opening.
Remove the application and obtain a legitimate replacement from the Mac App Store or the developer’s official website.
Do not force suspicious software to run simply because you need the application.
Why You Should Avoid Random Terminal Commands
Searching for a quick fix can lead you to websites that recommend commands to remove application security attributes or weaken macOS protections.
Some advanced troubleshooting commands may have legitimate uses in specific situations. However, copying commands blindly can create unnecessary risks.
A command that changes an application’s security attributes does not make the application safe. Instead, it may stop macOS from applying a security check designed to protect your Mac.
If you do not understand what a command changes, do not run it simply to get around an error.
Start with the safer fixes in this guide.
How to Prevent the “Mac App Is Damaged” Error
You can reduce the chances of encountering this problem by following a few simple habits.
Download Apps From Trusted Sources
Use the Mac App Store or the software developer’s official website whenever possible.
Keep macOS Updated
System updates can improve security, stability, and compatibility.
Keep Applications Updated
Developers frequently release updates that fix compatibility and security problems.
Avoid Modified Applications
Cracked, modified, or unofficial applications can trigger security warnings and may expose your Mac to malware.
Don’t Ignore Security Warnings
A security warning is not something you should automatically bypass. Find out why macOS is blocking the app first.
Mac App Damaged vs. Unidentified Developer: What’s the Difference?
Different macOS warnings can require different responses.
| macOS warning | What it can mean | Recommended action |
|---|---|---|
| App is damaged and can’t be opened | The app may be corrupted, modified, broken, or tampered with | Download a fresh copy |
| Developer cannot be verified | macOS cannot verify the developer | Verify the source before considering Open Anyway |
| Apple cannot check the app for malicious software | macOS cannot complete its malware verification | Check for an official version or contact the developer |
| App will damage your computer | macOS detected malicious content or another serious security issue | Remove it and obtain a legitimate copy |
The exact wording matters because each warning can require a different solution.
Related Mac Troubleshooting
If you’re still having problems opening applications on your Mac, these related troubleshooting guides can help you investigate other software and system issues:
- Mac Apps Not Opening? Try These Fixes — Use this guide when multiple applications refuse to launch or an app stops responding after an update.
- macOS Update Problems? How to Fix Common Update Errors — Helpful if the application stopped working immediately after upgrading macOS.
- Mac Security and Gatekeeper Problems: What to Do — Learn what to check when macOS security settings prevent an app from opening.
These guides form part of a broader Mac troubleshooting cluster. Only turn them into clickable internal links after the corresponding articles actually exist on KnowHowToFix.com.
Quick Fix Checklist
If your Mac app is damaged and can’t be opened, work through these solutions in order:
- Delete the affected application
- Download a fresh copy
- Use the Mac App Store or official developer website
- Restart your Mac
- Update macOS
- Update the application
- Check the exact security warning
- Verify application compatibility
- Use Open Anyway only when appropriate and only for trusted software
- Contact the developer if the problem continues
Official Apple Resources
If the steps above do not resolve the problem, these official Apple resources provide additional guidance for opening damaged apps, handling Gatekeeper warnings, and troubleshooting apps that will not open on a Mac.
- Open apps safely on your Mac — Apple explains how Gatekeeper checks apps downloaded from the App Store and the internet, including warnings for damaged apps, unidentified developers, and software that may contain malware.
Apple Support: Open apps safely on your Mac - The app has been modified or damaged — Apple explains why macOS may display a warning when an app’s signed code no longer matches the original. The guide also recommends deleting an app if you believe it has been damaged or tampered with.
Apple Support: The app has been modified or damaged - If you can’t open an app on Mac — Apple provides additional troubleshooting for apps that will not open because of damage, installation problems, permissions, or developer verification issues.
Apple Support: If you can’t open an app on Mac - Open a Mac app from an unknown developer — If your warning concerns an unidentified developer rather than a genuinely damaged app, Apple explains how to review the warning and use Open Anyway when appropriate.
Apple Support: Open a Mac app from an unknown developer - Open an app by overriding security settings — Apple documents the steps for manually allowing certain apps through System Settings > Privacy & Security, while warning about the security risks of bypassing these protections.
Apple Support: Open an app by overriding security settings - Install and uninstall apps from the internet or a disc — Use this Apple guide for official instructions on installing applications downloaded outside the App Store and removing problematic applications from your Mac.
Apple Support: Install and uninstall apps from the internet or a disc on Mac
Frequently Asked Questions
Why does my Mac say an app is damaged and can’t be opened?
macOS may display this warning when it detects that an application has been modified, corrupted, broken, or otherwise cannot pass its security verification. A damaged app may have corrupted files, or someone may have tampered with it.
How do I fix a damaged app on Mac?
The safest first step is to delete the affected application and download a fresh copy from the Mac App Store or the developer’s official website. Then update macOS and the app and try opening it again.
Is it safe to click Open Anyway on Mac?
Only if you completely trust the application and its source. Overriding security settings can increase your exposure to malware, so do not use Open Anyway simply to bypass a warning from an unknown application.
Why can’t I find Open Anyway on my Mac?
The option applies to certain security warnings, such as an unidentified developer or an app that macOS cannot verify. You normally need to attempt to open the app first and then check System Settings > Privacy & Security.
Should I disable Gatekeeper to open a damaged app?
No. Disabling or weakening macOS security protections should not be your first solution. If an application is genuinely damaged, replacing it with a clean copy is safer than bypassing Gatekeeper.
Can a macOS update cause an app to stop opening?
Yes. A macOS update can expose compatibility problems with older applications. If an app stopped working after an update, check the developer’s website for a version compatible with your current macOS release.
What if the app still won’t open after reinstalling it?
If the latest version from a trusted source still refuses to open, check the application’s compatibility requirements and contact the developer. The issue may involve application signing, compatibility, notarization, or a problem with the current release.
Final Thoughts
Seeing “App is damaged and can’t be opened” on your Mac can make it seem as though something is seriously wrong with your computer, but the problem often affects only the application.
Start with the safest solutions: delete the affected app, download a clean copy from a trusted source, reinstall it, restart your Mac, and install available updates.
If macOS displays an unidentified-developer or verification warning instead, check Privacy & Security and determine why the application is blocked before deciding whether an override makes sense.
If the application worked previously and suddenly became unavailable, think about recent app or macOS updates. Then check whether the developer has released a compatible version.
Most importantly, don’t disable your Mac’s security protections just because an application refuses to open. macOS uses these checks to protect your Mac from altered or malicious software.
If a clean installation from the official developer still produces the same warning, check compatibility or contact the developer rather than repeatedly bypassing the warning.
With the right approach, you can usually fix a Mac app that is damaged and can’t be opened without compromising your Mac’s built-in security.
Read More Articles On:
Windows 11 Black Screen: Fix It at Startup
Laptop Freezes When Opening One App: 4 Fixes That Work
