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You can skip Mojave entirely – the Catalina installer works directly from High Sierra. how to update macos high sierra 10136 to 1015
Since you are on High Sierra, the update may not appear automatically in "Software Update." You should use the method: Updating and Upgrading macOS High sierra - Apple Community Title: The High Sierra Ceiling One hour remaining
, you must first verify that your Mac hardware is compatible, as Catalina dropped support for many older models. Apple Support Community 1. Check Compatibility To check your Mac's model, click the Apple menu () About This Mac Apple Support Community 1
After thirty minutes of silence and progress bars, the Mac chimed one last time. A new desktop appeared. The owner logged in and was greeted by setup questions about Screen Time , and the choice between Light and Dark mode. High Sierra was gone. The Mac was now running Catalina 10.15