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Sep 2, 2021 · For High Sierra, Mojave or Catalina, Open Safari and click on this link, How to get old versions of macOS – Apple Support. Go to Check Compatibility to see if your mac qualifies for the OS upgrade you want. Then go to the Download OS section and click on the OS you want to install.
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Nov 26, 2023 · The direct download link for Catalina is here: macOS Catalina 10.15. Prior upgrades are found here: How to download macOS - Apple Support. Be forewarned, Macs with solid state drives will be updated in formatting to APFS with 10.13 or later (this is discussed later in the tip, but bears repeating).
Go to Software Update in System Preferences to find the macOS Catalina upgrade. Click Upgrade Now and follow the onscreen instructions to begin your upgrade. Upgrading from an older version of macOS? If you’re running High Sierra (10.13), Sierra (10.12), or El Capitan (10.11), upgrade to macOS Catalina from the App Store.
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macOS 10.15: Catalina (Jazz) – October 7, 2019 (Latest: 10.15.7, Security Update 2022-005, July 2022) macOS 11: Big Sur (GoldenGate) – November 12, 2020 (Latest: 11.7.10, September 11, 2023)