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Apple’s macOS High Sierra (version 10.13.6) introduced the Apple File System (APFS) for SSD-based Macs, Metal 2 graphics, and critical security patches. Although officially unsupported by Apple after late 2020, system administrators and retro-computing enthusiasts may still need to install this OS via a .dmg disk image—a container format commonly used for distributing installer bundles, firmware, or disk utilities. macOS High Sierra dmg download for making bootable