You can download directly through the Apple App Store using a compatible Mac, or obtain official Combo Updates for version 10.13.6 from Apple Support. While Apple provides the installer as an application, many users require DMG or ISO formats for creating bootable USBs or installing macOS on virtual machines. 1. Official Download Methods
Complete Guide to Downloading macOS High Sierra 10.13: ISO and DMG Files download macos high sierra 1013 iso and dmg upd
If you already have an earlier version of 10.13, download the macOS High Sierra 10.13.6 Combo Update to bring your system to the final stable version. You can download directly through the Apple App
If you are on a compatible Mac, use the direct App Store link. Standard searches within the App Store often fail to show older versions. download macos high sierra 1013 iso and dmg upd