macOS High Sierra 10.13
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Download and Installation
Another significant update is the introduction of HEVC (High Efficiency Video Coding) video encoding, which provides better compression and higher quality video playback. This update is particularly important for content creators and consumers, as it enables smoother and more efficient video editing and playback.
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Apple does officially provide public DMG downloads for old macOS versions. The safest and only legal method is to download from Apple via the App Store (if you’ve previously purchased it) or from Apple’s official support page for older installers.