10.15 ^new^ — How To Update Macos High Sierra 10.13.6 To

You’ll be asked which disk to install Catalina on. Choose your (likely named “Macintosh HD”).

Since macOS Catalina is no longer the latest version, it may not appear in the “Updates” or “Recommended for you” section. Use one of these methods: how to update macos high sierra 10.13.6 to 10.15