Macos High Sierra 10.13.6.iso File

Apple still hosts the Install macOS High Sierra.app on its support servers. Even if you are on Windows, you can ask a friend with a Mac to download this.

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ High\ Sierra.app --nointeraction Macos High Sierra 10.13.6.iso

It is surprisingly responsive on older hardware, especially machines with early SSDs that benefit from APFS. Compatibility Apple still hosts the Install macOS High Sierra