You would need to get the Install macOS [version name].app, and then convert the InstallESD.dmg inside that to an .iso to mount to your VM for the install. Ther

You would need to get the Install macOS [version name].app, and then convert the InstallESD.dmg inside that to an .iso to mount to your VM for the install. There are more steps involving bootloaders which I have included in the second link. https://github.com/rmc-team/macos-downloader/ https://github.com/rmc-team/macos-downloader/ https://en.wikibooks.org/wiki/VirtualBox/Setting_up_a_Virtual_Machine/Mac_OS_X https://en.wikibooks.org/wiki/VirtualBox/Setting_up_a_Virtua... https://github.com/myspaghetti/macos-virtualbox https://github.com/myspaghetti/macos-virtualbox