Launch Disk Drill. The main window will display a list of all your internal and external storage devices (hard drives, SSDs, USB flash drives, memory cards). Select the specific drive where your data was lost.

: If you own an older version of the software, you may be eligible for a 50% discount on newer versions, such as Disk Drill 6. How to Use the Activation Key

What were the files lost from (internal hard drive, external USB, SD card)?