Can't Be Opened Because It Is from an Unidentified Developer, How to Fix?

"Can't Be Opened Because It Is from an Unidentified Developer." This error occurs because macOS protects you from running potentially unsafe software. Learn how to safely open applications from developers not registered with Apple while maintaining your system's security.

Security Note: Only bypass this warning for applications you trust. Download software only from official sources.

Frequently Asked Questions

Q1. Why does macOS block apps from unidentified developers?

macOS includes a security feature called Gatekeeper that helps protect your Mac from malicious software. By default, it only allows apps from the App Store or identified developers (those with a Developer ID certificate from Apple).

Q2. How can I safely open an app from an unidentified developer?

Method 1: Use the Context Menu (Recommended)

(1) Locate the application in Finder (usually in your Applications folder or Downloads);

(2) Right-click (or Control-click) on the application;

(3) Select "Open" from the context menu;

(4) When the warning appears, click "Open".

This grants a one-time exception to run the application.

Method 2: Adjust Security & Privacy Settings

(1) Go to Apple menu > System Preferences > Security & Privacy;

(2) Click the "General" tab;

(3) Under "Allow apps downloaded from," you'll see a message about the blocked app;

(4) Click "Open Anyway" next to the warning message.

Q3. What if the "Open Anyway" button doesn't appear?

If you don't see the "Open Anyway" option in Security & Privacy settings:

Method 3: Use Terminal Command

(1) Open Terminal (Applications > Utilities > Terminal);

(2) Type: xattr -d com.apple.quarantine;

(3) Drag the application from Finder into the Terminal window (this adds its path);

(4) Press Enter to execute the command;

(5) Now try opening the application normally.

Q4. Should I disable Gatekeeper completely?

Disabling Gatekeeper entirely is not recommended as it removes an important layer of security protection. Instead, use the methods above to make exceptions for specific applications you trust.

Tip: If you regularly use apps from unidentified developers, you can temporarily adjust Gatekeeper settings, but remember to restore them afterward:

(1) Open Terminal;

(2) Enter: sudo spctl --master-disable (enter admin password when prompted);

(3) To re-enable: sudo spctl --master-enable.

macOS Security Settings by Version

macOS Ventura (13+):

System Settings > Privacy & Security

macOS Monterey (12):

System Preferences > Security & Privacy

macOS Big Sur (11):

System Preferences > Security & Privacy

Catalina & Earlier:

System Preferences > Security & Privacy

Still Can't Find Your Answer?

Please feel free to contact us via the online feedback, or via email at support@coolmuster.com with the following details, and we'll get back to you within 24 hours during business days.

(1) Your computer's operating system (e.g., Windows 11, macOS Ventura).

(2) Program name and version you're using.

(3) Device details: Brand, model, and Android/iOS version.

(4) Steps taken before the issue occurred.

(5) Screenshots of the problem (if possible).

This helps us resolve your issue faster. More products FAQs >>

* Tips: How to take a screenshot:

- On Windows PC, you might press "Print Screen (SysRq)" key on your keyboard, then click "Start" > "All Programs" > "Accessories" > "Paint", press "Ctrl" + "V" to paste the screenshot, then save the picture and attach it to your email.
- On Mac, you can press the "Shift" + "Command" + "3" to take a full screenshot and send it to us.