
Hello and welcome to the Microsoft Community!
According to your error message: An error occurred. (Error code: 9) (Extra code: 0)
This issue may be caused by some system settings or network issues. You can try the following solutions:
1. Restart your Mac and try reinstalling Edge browser.
2. Make sure that your Mac system and all drivers are up to date.
3. Check your internet connection to make sure it is stable.
4. Disable your antivirus software or firewall and try installing Edge again.
5. Try installing using another network connection.
Disclaimer: Temporarily turn off antivirus protection. However, keep in mind that if you do so, your device may be vulnerable to threats. So please turn it on immediately once issue fixed.
If you encounter any difficulties or problems during the installation process, you can refer to the following link for assistance:
Troubleshooting tips for installing and updating Microsoft Edge - Microsoft Support
If you have doubts or concerns about turning off Windows Firewall you can refer to the following link:
Turn Microsoft Defender Firewall on or off - Microsoft Support
We hope the above suggestions are helpful and look forward to your feedback.
We are committed to a customer-first service philosophy. If you have any comments or suggestions about the service provided by Microsoft engineers in the forum, please feel free to raise them so that we can provide better service.
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Best Regards!
Leo - MSFT | Microsoft Community Support Specialist