Disk-Drill-5.1.1111.dmg is an installer for a specific version of Disk Drill for Mac, a popular data recovery software developed by CleverFiles . This specific build (5.1.1111) was part of the early Disk Drill 5
Double-click the .dmg file. macOS will verify the signature and mount it as a virtual volume named "Disk Drill 5.1.1111" in your Finder sidebar. Disk-Drill-5.1.1111.dmg