Niresh created a patched version of the Mavericks installation DMG file, which allowed users to install macOS Mavericks on non-Apple hardware, also known as Hackintoshes. This was a significant achievement, as Apple's operating system was (and still is) designed to run exclusively on Apple-branded devices.
A DMG (Disk Image) file is a type of file used by macOS to distribute software packages, including the operating system itself. It's essentially a mountable image file that contains the installation files for macOS. niresh mavericks dmg work
You're referring to Niresh's Mavericks DMG (Damage) Work! Niresh created a patched version of the Mavericks