macOS High Sierra 10.13.6 Combo Update (recommended for updating from any version of 10.13). macOS High Sierra 10.13.6 Update .
Apple provides "Combo" and standard updates for specific versions: mac os x 1013 high sierra dmg download hot
Third-party tools like Mist or the macadmin-scripts on GitHub can help automate the download and conversion to a DMG file. Compatibility & Safety macOS High Sierra 10
The standard App Store download provides an .app file in your Applications folder, not a .dmg . To create a bootable disk image or USB drive for a clean installation: mac os x 1013 high sierra dmg download hot
macOS High Sierra 10.13.6 full installer - Apple Communities
Use Disk Utility to format a drive (at least 16GB) as Mac OS Extended (Journaled) .
Depending on your current system, use one of the following official channels: