Download the latest installer from the official website. Step 2: Run Argus Monitor as Administrator. (Right-click the shortcut > Run as administrator). This is mandatory for fan drivers to load. Step 3: Click the "Info" tab at the top of the main window. Step 4: Click the button labeled "Enter License Key" (or "Register"). Step 5: Copy and paste your license key exactly as it appears in your purchase email. (Avoid manual typing – zeroes and the letter 'O' are easily confused). Step 6: Click "Activate" . The software will phone home to the licensing server. Step 7: Restart Argus Monitor. You should see "Licensed to [Your Name]" in the Info tab.