The trial version allows you to see your lost files. If you can see them in the preview, the software works.

Because it was highly effective, many users still seek out this specific older version, often accompanied by searches for a "license key" or "serial number" to bypass the purchase price. The Dangers of Using "Free" License Keys

Do you have a or a drive type (like an external HDD or SSD) that you're currently trying to recover?