So follow these steps to download and update macOS: Make sure you have a fast and stable WiFi connection. Don't use public networks in cafes/hotels for upgrades, they can be of poor quality and interrupt the process. Open the App Store app on your Mac. Fin the last tab in the top menu, Updates. Click it. Anapp called Install macOS Catalina will open automatically. Click Continue to proceed. To install the update later, quit the program. You can find it again later in your Applications folder. Review the software license agreement and click Agree to accept it. Click Agree in the window that appears to confirm. Theseinstructions work the same for macOS 10.13 High Sierra and 10.14 Mojave. the extension file entirely after the upgrade). I recommend a fresh install, but if you Heres every Mac operating system since Mac OS X launched. macOS 10.13: High Sierra (Lobo with the arrival of Ventura in October 2022 Apple ceased support for Catalina, which arrived in VersionCodename macOS 10.13 High Sierra macOS 10.14 MojavemacOS 10.15 CatalinamacOS 11 Big Sur 8YRz4dh.

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