Whether you are on a Mac or Windows OS, Disk Drill will require you to upgrade to the premium version to get unlimited data recovery. The developers tell Mac users to have data protection commands turned on to get a portion of the free file recovery methods. Certain file systems can only be previewed with the free Mac software version.
The Windows plan gives you 500 MB of data recovery, while the Mac download does not. The free Disk Drill for Mac package is different from the free download for Windows since the macOS freeware is more limited.