How to Update macOS High Sierra 10.13.6 to macOS Catalina 10.15
In High Sierra, updates appear in the App Store, but major version upgrades often require a direct link or a specific search. Open the on your Mac. Search for "macOS Catalina" .
macOS Catalina dropped support for several older Mac models that were able to run High Sierra. Before proceeding, you must confirm that your specific hardware is officially supported by Apple for this version. how to update macos high sierra 10136 to 1015
With your preparation complete, you can start the upgrade. If you face issues with the App Store, see the first troubleshooting tip below.
Open your essential applications to check if they require updates to work in 64-bit mode. How to Update macOS High Sierra 10
It looks like you want to upgrade from to macOS Catalina (version 10.15) — I assume “10136” is a typo for 10.13.6, and “1015” means 10.15.
Choose your main hard drive (usually "Macintosh HD") and click Install . macOS Catalina dropped support for several older Mac
To gather the necessary information, I need to search for various aspects. I will search for Apple's official upgrade guide, system requirements for Catalina, how to check for updates on High Sierra, how to download the Catalina installer, how to create a bootable USB drive, common issues after upgrading, and specific problems like "Catalina won't install from High Sierra" and "High Sierra not showing Catalina update." I will also search for troubleshooting steps for Catalina upgrade failures and how to run Disk Utility First Aid before upgrading. search results for specific articles (0) and discussions (1-7) are not comprehensive enough for a full guide. I need to gather more detailed information from official and reliable sources. I'll open the top results from the search for system requirements, the guide, and discussions about missing updates. I'll also search for more specific topics like how to download the full Catalina installer and how to create a bootable USB installer using Terminal. opened results provide some useful information. The Apple support page lists compatible models. The computingarchitectures.com article outlines general steps. The Apple discussions threads highlight common issues like the App Store not showing the update, the importance of hardware compatibility, and the need to check 32-bit app compatibility. The iboysoft article explains why older macOS versions might not appear in the App Store and provides direct download links.