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Mac OS X Snow Leopard - Wikipedia
macOS version history - Wikipedia
How to Download and Install Older Versions of macOS - How-To Geek
macOS compatibility: What macOS versions can my Mac run ... - Macworld
How to download and install macOS - Apple Support
macOS - Wikipedia
Download and install older versions of OS X on a Mac - MacPaw
macOS High Sierra - Technical Specifications - Apple Support
macOS versions: Every update including the latest | Macworld
macOS Compatibility Checker: What macOS Can My Mac Run?