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Early 2009 20-inch iMac running macOS Catalina with the dosdude1 Catalina patcher. Runs great and has no issues! : r/CatalinaPatcher
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Customizing macOS Catalina: Fantastic Tricks, Tweaks, Hacks, Secret Commands & Hidden Features: Amazon.co.uk: Magrini, Tom: 9781691847549: Books
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Developer's Visual Comparison of macOS Catalina and Big Sur Offers Closer Look at Apple's UI Redesign for Macs | MacRumors Forums
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