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Boot macOS Big Sur and complete the initial setup.Set the virtual machine's USB version to 1.1 and disable all network adapters from the VirtualBox settings (AppleKeyStore, the system's secure keychain, crashes otherwise).When the macOS initial setup starts, shut down macOS with Command-Q Run "Install macOS Beta.app", select "Show All Disks." and select the new empty disk.
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Download Big Sur InstallAssistant.pkg (9GB) either inside the virtual machine or on the host on a disk image that will be mounted on the virtual machine.Here's how to run macOS Big Sur on VirtualBox:
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