When you try to install your McAfee security software such as LiveSafe or Total Protection on macOS versions up to 10.15 (macOS Catalina), the installation might fail with the following message:

System Extension Blocked
A program tried to load new extensions signed by McAfee, inc. If you want to enable these extensions, go to the Security & Privacy System Preference pane.

When you start your McAfee software after seeing this message, your security status is red, or shows as At risk.


Changes to the standard installation procedure in macOS cause this issue. These changes were introduced in macOS High Sierra (10.13) and are also present in later versions of macOS.

When an app tries to enable a system or kernel extension during installation, macOS prompts the user to authorize the installation. A system or kernel extension is commonly known as a kext. This issue never occurred in earlier versions of macOS because the kext was installed automatically without the user being prompted.

The McAfee system extension used in our security products for Mac allows our virus scanner, firewall, and WebAdvisor components to integrate closely with macOS.

To authorize the system extension, watch the video or follow the step-by-step instructions below:

To view and subscribe to more videos, visit the official McAfee YouTube channel.

  1. Click the McAfee menulet on the menu bar.
  2. Select McAfee (product name) Console. For example, McAfee LiveSafe Console.
  3. ​Click Mac Security and enable a security feature such as Real-Time Scanning, or Firewall.
  4. ​Look for the We need permission prompt. The full message is:

    We need permission
    Allow us to load our software from the Security & Privacy pane so we can set up your protection

  5. ​Click OK. This action allows the process to continue.

​The kernel extension is authorized.

  1. ​Click the Apple menu at the top left of your desktop.
  2. ​Click System Preferences.
  3. ​Click Security & Privacy.
  4. Click the lock. (You can then make changes.)
  5. Click the General tab.
  6. Under Allow apps downloaded from, select:

    App Store and identified developers

  7. Look for the message that says:

    System software from developer “McAfee, Inc” was blocked from loading.

  8. ​Click Allow to enable the extension.
  9. Close the Security & Privacy window.

The kernel extension has been authorized.

Source : Official McAfee Brand
Editor by : BEST Antivirus KBS Team

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