A takes the official installer, extracts the system files, and converts them into a bootable ISO – sometimes stripping recovery partitions or adding custom bootloaders (OpenCore, Clover).
Run softwareupdate --fetch-full-installer to download the latest available version of Big Sur directly to your Applications folder.
You can still obtain the official Big Sur 11.0.1 installer directly from Apple to ensure system integrity:
Introduced a complete UI redesign, Control Center for Mac , a revamped Notification Center, and Safari performance improvements.
