Do not use an old setup file from a USB drive. Go to the official site and download the most recent version (as of 2025, version 6.5+).
Copy the key exactly as it appears in your purchase email. Format matters. Example structure: ARGUS-XXXXX-XXXXX-XXXXX-XXXXX argus monitor license key new
Right-click the installer and select "Run as Administrator." This is mandatory because Argus Monitor installs a kernel driver for fan control. Do not use an old setup file from a USB drive
