QCOW2 supports native zlib compression and AES encryption directly within the disk image layer. The Reality of "Exclusive Download Updates"
Boot your QEMU configuration using an OpenCore EFI bootloader customized for virtual environments. Pass both the BaseSystem.img (as a virtual installer drive) and your blank mac_hdd.qcow2 to the virtual machine. Managing macOS Updates (UPD) in Virtual Environments mac os qcow2 exclusive download upd
Downloading pre-compiled QCOW2 images from third-party forums, torrent sites, or untrusted file-sharing networks poses major risks: QCOW2 supports native zlib compression and AES encryption