The official, easiest way to get High Sierra is the Mac App Store. However, Apple has increasingly buried or removed older installers. If you try to search for “High Sierra” on a modern Mac running Ventura or newer, you might get no results. Even if you find a link, clicking it may fail with the error: “This copy of the Install macOS High Sierra.app is damaged, and can’t be used to install macOS.”
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Once you have your working 10.13.6 installer, back up the DMG to an external hard drive and to cloud storage. Apple will not host these files forever. Treasure that copy—it is the key to keeping your old Mac alive. The official, easiest way to get High Sierra
If you need a DMG to create a bootable USB (useful for clean installs or reviving older Macs), follow these steps: Even if you find a link, clicking it
Apple hides older installers, but they are still hosted on their servers. The easiest way to get the installer is via the direct Mac App Store link.
MacOS High Sierra 10.13.6 is a significant update to the MacOS operating system, released on July 9, 2018. This version brings several notable improvements, including:
Prepare bootable USB using createinstallmedia on a clean macOS system.