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Double-click DiskScout-1.0.1.dmg. A window opens with the app and an Applications shortcut. Drag the icon across, then eject the disk image.
Open DiskScout from Applications or Spotlight.
Without it, macOS hides Mail, Messages, Safari and a few Library folders, so totals come out low. DiskScout shows a banner with an Open System Settings button. Toggle DiskScout on under Privacy & Security → Full Disk Access, then press Re-check. Nothing is read until you scan, and nothing ever leaves your Mac.
Press Home for the fastest useful result, or Scan full Mac for everything. The app shows the file count and elapsed time when the scan finishes.
~/Library/Application Support/DiskScout (snapshots, cleanup history, licence). Delete that folder too if you want a clean slate.