Installing from a bootable drive is more reliable than running the app directly. Format your USB: Connect a drive (16GB+), open Disk Utility , and format it as Mac OS Extended (Journaled) GUID Partition Map Run Terminal Command: with your USB drive's name:
If the above methods fail (common on older OS X versions), some reputable Mac communities host the DMG. Only download from known sources like:
Select the root drive from the left sidebar and click . Configure the settings exactly as follows:
Terminal will connect to the official Apple servers and begin pulling the full 5.2 GB installer.
Before you begin
Confirm the download. The installer will save directly to your folder as Install macOS High Sierra.app . Method B: Convert the Installer to a DMG File
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
If you want to wipe your drive and start fresh (highly recommended for older machines), don't run the installer from your current desktop. Create a bootable USB drive.
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled Use code with caution. macos high sierra download dmg install
mdls /Applications/Install\ macOS\ High\ Sierra.app | grep kMDItemVersion
for offline deployment or troubleshooting multiple systems.
For users who have a Mac that is compatible with High Sierra and currently running a version of macOS that allows App Store access, the Mac App Store remains the safest and simplest option. Apple still hosts the High Sierra installer through the App Store, though accessing it requires either a compatible Mac or a direct link.
For users comfortable with the command line, Apple's softwareupdate command can sometimes retrieve older macOS installers. This method requires pointing softwareupdate to Apple's servers or to an internal server where the installer has been made available. While effective for experienced users, this approach is more complex than the other methods described here. Installing from a bootable drive is more reliable
: At least 14.3 GB of available storage space to perform the installation.
Type the following command exactly and press Enter: softwareupdate --fetch-full-installer --full-installer-version 10.13.6
Format the drive explicitly as Mac OS Extended (Journaled) first using Disk Utility. The installer will determine if an automated conversion to APFS is supported by your storage drive.
I can provide specific Terminal commands or alternate download workflows based on your setup. Share public link Configure the settings exactly as follows: Terminal will