: If you previously purchased/downloaded High Sierra through the Mac App Store, it may still be in your Purchased tab (on older macOS versions or if your Apple ID had it).
, though verifying the integrity of such files is paramount for security. macOS High Sierra - App Store macos high sierra 10.13.1 dmg
A few important points:
However, be aware: If you use it online, you are vulnerable to known exploits. Use a robust firewall, modern browser (Firefox ESR or Chromium Legacy), and avoid storing sensitive data. macOS High Sierra 10