. With a click, the App Store finally revealed the 8GB prize: macOS Catalina Chapter 3: The Long Descent (Download) The owner clicked
This is usually caused by insufficient disk space or a corrupted download. Delete the installer from your Applications folder, free up storage, restart your Mac, and redownload it.
Select your main internal storage drive (usually named ). Click Install and enter your administrator password. how to update macos high sierra 10136 to 1015
Yes, only if your Mac supports Catalina. High Sierra (10.13.6) can go directly to Catalina (10.15) via the Software Update pane or the Catalina installer.
What changes to expect
Because macOS Catalina is an older operating system, it will not appear automatically in your High Sierra Software Update panel. You must pull it directly from the Mac App Store via a specific link.
Your Mac will restart to begin the installation process. A progress bar and an estimated time remaining will appear on a black screen. Keep your Mac plugged into power and do not close the lid or turn it off during this time. Troubleshooting Common Installation Issues Select your main internal storage drive (usually named )
If you are still running macOS High Sierra (10.13.6), you are several major releases behind. While High Sierra was a solid performer, it no longer receives security updates from Apple. Upgrading to at least macOS Catalina (10.15) (or newer, like Big Sur, Monterey, or Ventura depending on your Mac model) is critical for security, app compatibility, and new features.
Because you are running High Sierra, you may not see Catalina in "Software Update" within System Preferences. You must use the App Store: macOS - How to Upgrade - Apple (SI) High Sierra (10