Look for the "Activate" or "Upgrade" link at the bottom right of the main interface.

This version offers the firewall, antivirus, and sandbox. It does not require a paid license key and provides enterprise-grade protection for home users at no cost.

If you already own a license but lost your key, you can log in to the . This portal lists all your active subscriptions and provides your license strings and expiration dates. How to Activate Your License Key

If you are looking for a , the safest and only recommended method is through the official Comodo channels. 1. The Official Purchase Link

This is Comodo's "secret sauce." If a file isn't on Comodo's "safe" list, it is automatically run in a virtual environment (sandbox). Even if the file is malicious, it cannot touch your actual system files or personal data.