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Apple has never distributed macOS as an official "ISO." Apple uses .app bundles and .dmg files. However, the term "ISO" is universally understood for creating bootable media for virtual machines (VMware, VirtualBox, Proxmox) or burning to DVD. --- Mac Os X El Capitan 10.11.1 Iso Download BEST
Archive.org hosts verified, checksum-matched copies of macOS installers. Before you download any file from the internet