mac os version 10.15 download?

How To Upgrade To macOS Catalina | How to Install macOS 10.15 Catalina on Mac

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.

How to Install MacOS Catalina 10.15 on an Unsupported Mac, iMac, Mac Pro or Mac Mini in 2021

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