Official versions of macOS High Sierra 10.13.6 are not natively distributed as ISO files by Apple. Instead, Apple provides the software as an installer app through the Mac App Store or as a disk image (.dmg) on their support pages.
Technical Specs: You need at least 2GB of RAM and approximately 14.3GB of available storage to perform the upgrade. How to Create a Bootable ISO for Virtual Machines macos high sierra 10.13 6 iso download
The following script creates a blank DMG, mounts it, writes the installation media, and converts it to an ISO. This must be run in Terminal. Official versions of macOS High Sierra 10
(likely for a virtual machine like VMware or VirtualBox), you’ll need to use the Terminal to "piece" it together from the installer app. Follow these steps once you have the installer in your /Applications Create a blank disk image: How to Create a Bootable ISO for Virtual Machines 4
Following these steps gives you a clean, official macOS High Sierra 10.13.6 ISO without relying on third‑party downloads.