If you are using Windows 10/11, you likely have no need for IE Tab Extra Quality. The native Edge IE Mode is the superior solution.

Finding a "free license key" for is generally not possible through official channels, as the software transitioned to a subscription-based model. While the extension itself can be downloaded for free from the Chrome Web Store and Microsoft Edge Add-ons , full access to its features requires a paid license after a trial period. Licensing Overview

"Navigating the Digital Landscape: Understanding IE Tab and Its Alternatives"