Because this is the final 10.13.6 build (with the 2021 security patches), you get:
macOS High Sierra 10.13.6 – InstallAssistant.pkg
(Full offline installer – works on any supported Mac)
https://download.info.apple.com/Mac_OS_X/061-91329.20180709.CFHS6/macOSUpdCombo10.13.6.dmg
Alternative: Installer app (for USB creation)
(Requires a Mac running High Sierra or Mojave)
https://itunes.apple.com/us/app/macos-high-sierra/id1246284741?mt=12
Note: The App Store link will only work if your Mac is compatible with High Sierra (2009–2017 models). download+macos+high+sierra+10136+exclusive
Running High Sierra in 2024 is like driving a classic car without airbags. Apple no longer issues security patches for 10.13.
If you see that message after downloading, your Mac’s certificate is expired. Fix it by:
You don’t need third-party tools. Use Apple’s built-in createinstallmedia: Because this is the final 10
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
You now have an exclusive offline installer that works on any Mac that officially supports High Sierra.
Apple distributes software via a content delivery network (CDN). There is an exclusive, direct HTTP link to the InstallAssistant.pkg for 10.13.6 that bypasses the App Store entirely.
Warning: This package is 5.2GB. Ensure you have a stable connection. macOS High Sierra 10
Copy and paste the following link into your browser (this is the official, signed Apple CDN URL):
http://swcdn.apple.com/content/downloads/00/23/041-18175/9pm42fea7rpm74vv3rnmz8srz6rs7t3rfa/InstallAssistant.pkg
Verify the checksum: A safe 10.13.6 package will have a SHA-1 hash starting with 0c7e87e2.... If your download finishes in 10MB, delete it immediately.
Let's not pretend this is safe for daily driving in 2026. The last security update for High Sierra was November 2021. That means:
Use this exclusively for: