VirtualBox/Setting up a Virtual Machine/macOS High Sierra

Installation script

The following installation script:

...is free and open-source
...requires only VirtualBox with its Extension Pack and dependencies that can be easily installed in a single command with most open-source package managers
...downloads macOS Catalina, Mojave and High Sierra directly from Apple's servers
...installs macOS without modifying the original Apple binaries and without third-party bootloaders
...creates a VM that is compatible with OpenCore and can be exported (with manual modifications) to KVM/QEMU for near-native performance
...runs on Linux, Windows (WSL, Cygwin), and macOS