Users are advised to generate their own bootable media from the official App Store download to ensure system integrity and security.
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
Download macOS High Sierra 10.13.6 Combo Update - Apple Support macos high sierra 10136 dmg
Open (Applications → Utilities → Terminal).
Once complete, the installer will appear in your /Applications folder as Install macOS High Sierra.app . Method B: Use Terminal for Direct Apple Servers Users are advised to generate their own bootable
from the Mac App Store. However, because it's hidden, you may need to use a direct App Store link that opens the installer page. Installation Tips Back Up First: Always use Time Machine to back up your data to an external drive before updating. Hardware Check:
: Introduced Messages in iCloud , allowing your entire message history to sync across all Apple devices. How to Obtain the DMG Method B: Use Terminal for Direct Apple Servers
If you downloaded a small 22 MB “stub” installer instead of the full 4.8 GB file, this occurs because Apple now redirects the download to a lightweight online installer.
This is the most reliable way to jump to the final version if you are already on an earlier version of High Sierra (e.g., 10.13.1). You can find it on the official Apple Support Download page Standard Update: