The means to obtain a disk image file containing the installation files for a specific version of the macOS operating system, High Sierra 10.13.6, can be described by these terms. The ‘dmg’ file format is a common type used by Apple to distribute software. Acquiring this file enables the user to create bootable media or perform a clean installation of the operating system on a compatible Macintosh computer. As an example, a user with an older Mac that is compatible with High Sierra, but not newer operating systems, might seek such a file.
Access to this particular macOS version is often critical for users with hardware limitations, legacy software requirements, or a preference for a specific operating environment. It provides a route to maintain system functionality, address compatibility issues with older applications, or restore a system to a known working state. Furthermore, the existence of readily available installation media simplifies the process of troubleshooting, repairing, or reinstalling the operating system. Historically, obtaining older versions of macOS has become more challenging as Apple primarily focuses on supporting and distributing the newest releases.