411 REFERENCE · Wikibooks
VirtualBox/Setting up a Virtual Machine/macOS Catalina
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Compatibility
macOS Catalina 10.15.2 and 10.15.3 (and possibly every later version) are only compatible with VirtualBox version 6.1.4 or greater.
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
https://github.com/myspaghetti/macos-guest-virtualbox - Push-button installer of macOS on VirtualBox