To download macOS High Sierra 10.13.6, you can use official Apple links or community-driven archives. Note that while Apple provides update files as disk images (.dmg), the is typically distributed via the Mac App Store as an application. Official Apple Download Methods
Downloading the DMG is only half the battle. To install High Sierra on a clean hard drive or a machine that won’t boot, you need a bootable USB installer. download macos high sierra 10.13.6 dmg mac
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Note: If the official Apple link is dead (Apple occasionally retires them), proceed to Method 2 or 3. To download macOS High Sierra 10