...This is valuable for developers who want to test, build, or deploy within macOS without relying on physical Mac hardware or for backward-compatibility testing. The repo documents the steps clearly, handles corner-cases like older OS versions, and provides paths to unlock Guest Additions and optimize VM settings. While specific about VirtualBox and macOS versions, it remains a practical reference for anyone needing a macOS VM this way. It also illustrates how to deal with Apple installer artifacts, command line tooling, and VM setup in a repeatable and scriptable manner.