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HP Printers - A 'System Extension Blocked' Message Displays (macOS)

This document is for HP printers and macOS Mojave (10.14) and Catalina (10.15).
When installing an HP print driver, a System Extension Blocked error message displays during driver installation.
System Extension Blocked error message
Use Apple's Security and Privacy System Preferences to allow the required extensions to install for your printer to work correctly.
  1. Open the Security & Privacy preferences.
    • If the error message displays, click Open Security Preferences.
      Clocking Open Security Preferences on the System Extension Blocked error message
    • If the error message does not display, open the Apple menu, select System Preferences, and then click Security & Privacy.
      Clicking Security & Privacy in System Preferences
  2. On the General tab, click Allow next to the HP Inc. was blocked from loading message.
    Clicking Allow on the General tab
  3. If a Legacy System Extension message displays, click OK.
    Clicking OK on the 'Legacy System Extension' message
  4. Restart the computer to finish the installation.