Downloading the macOS Big Sur DMG directly can be tricky because Apple primarily distributes it through the Software Update
This method works even when the App Store shows "This version is no longer available." macos big sur dmg download exclusive
🔐 This is a private, authenticated download. Links are rate-limited and tracked for security. Downloading the macOS Big Sur DMG directly can
Use the createinstallmedia tool (located inside the installer app) to flash the OS onto that image. Compatibility & Build Versions macos big sur dmg download exclusive