Mac App Is Damaged and Can't Be Opened — How to Fix It

What Does This Error Mean?

Your Mac's security system (Gatekeeper) is blocking the app. It doesn't trust where the app came from. This is common with apps downloaded from the internet rather than the App Store.

Affected Models

macOS Sequoia
macOS Sonoma
macOS Ventura
macOS Monterey

Common Causes

The app was downloaded from outside the Mac App Store
The app's security certificate has expired or is missing
macOS quarantined the app automatically when it was downloaded
The app file got corrupted during download
Apple's Gatekeeper security setting is set to App Store only

How to Fix It

First, make sure you trust the app and it came from a legitimate source.

Never bypass this warning for apps from unknown or suspicious websites.
Open System Settings, go to Privacy and Security, and scroll down.

You will see a message about the blocked app near the bottom of the page.
Click Open Anyway next to the app name. Confirm when macOS asks again.

This tells Gatekeeper you trust this specific app and want to run it.
If there is no Open Anyway button, open Terminal and type: xattr -cr followed by a space, then drag the app into the Terminal window and press Enter.

This removes the quarantine flag macOS added when you downloaded the app.
If the app is still damaged, delete it and download a fresh copy directly from the developer's official website.

The original download may have been corrupted. A fresh download usually fixes this.

When to Call a Professional

You rarely need help with this — it is almost always a Gatekeeper issue. If you are unsure whether an app is safe to open, research it before bypassing security warnings.

Frequently Asked Questions

Is it safe to bypass the damaged app warning?

Only if you fully trust where the app came from. Apple blocks apps to protect you from malware. If you are unsure, check the developer's official website before proceeding.

Why does this happen more often on newer versions of macOS?

Apple has tightened security in recent macOS versions. Apps that worked fine in older macOS may now get blocked. The fix is usually the same — use Open Anyway in Security settings.

What does the xattr command actually do?

It removes a hidden tag macOS adds to files downloaded from the internet. This tag tells Gatekeeper to check the file before running it. Removing the tag lets macOS treat it like any other app.