If the App Store link does not work, you can sometimes retrieve the installer via Terminal if the software catalog still lists it.
Before proceeding, be aware that downloading macOS installation files from third-party "mirror" sites carries risks. Files may be corrupted, outdated, or contain malware. The methods below are listed in order of safety and reliability. download macos high sierra 1013 6 dmg file link
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. If the App Store link does not work,
Tools Required: A Mac and a USB drive (8GB+) or a blank disk image. The App Store download provides an application installer,
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.
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: