Download the latest version of HitmanPro from the official Sophos site.

The "exclusive" version 3.8.30 (Build 326) is an older version of HitmanPro from around 2022. It was a legitimate version of the software, but searching for its key today is almost certainly going to lead you to dangerous websites.

Sophos frequently runs seasonal sales and bundle discounts on their official website, making genuine licenses highly affordable. Step-by-Step: Activating Your Trial safely