Some features require an Apple ID terms apply. You’ll need the following: OS X 10.9 or later 4GB of memory 35.5GB available storage on macOS Sierra or later. If your Mac is running OS X Mavericks 10.9 or later, you can upgrade directly to macOS Big Sur. It is complete bootable Mavericks 10.9 DMG Disk Image for Clean OS Install.
Mac OS X Mavericks Free Download DMG 10.9 Bootable Installer Version.
