The App Store download provides an application installer, not a DMG file. To get the DMG file required for bootable media or virtual machines, you must convert the downloaded app.
Tools Required: A Mac and a USB drive (8GB+) or a blank disk image.
Option A: Using Terminal (CreateInstallMedia) Apple provides a built-in tool to create a bootable installer, which formats a drive with the necessary OS files. download macos high sierra 1013 6 dmg file link
Option B: Creating a DMG for Virtual Machines (VMware/VirtualBox)
If you need a specific .dmg file rather than a bootable USB, you can create one from the downloaded App:
Before presenting the direct download, understand the difference: The App Store download provides an application installer,
The link provided below is the official Apple CDN (Content Delivery Network) link for the final version 10.13.6 (17G66). This is a digitally signed, unmodified installer wrapper.
If you have “Install macOS High Sierra.app”: Option B: Creating a DMG for Virtual Machines
If you only have a standalone InstallESD.dmg:
Direct download links for specific macOS versions are typically not provided by Apple due to the reasons mentioned above. However, some educational and business environments may have access to specific version downloads through their agreements with Apple.