Visit the official Apple Support page for legacy installers.
Click . This will download the "Install macOS High Sierra" app directly into your /Applications folder. 2. Creating a DMG from the Installer
APFS (Apple File System) Conversion Tool
, several reliable methods exist to obtain the full installer for your needs. Official Download Methods Mac App Store (Recommended) this official link to open the High Sierra page in the Mac App Store.
Are you trying to install this on a newer Mac, a Virtual Machine, or an older unsupported machine?
This open-source tool allows you to download full macOS installers and firmwares directly from Apple's servers without using the App Store. You can find it on Mist GitHub Releases.