Stuck at version 10.13.6, need 10.15. Not… - Apple Community
Transitioning from 10.13 to 10.15 changes system files, user permissions, and the underlying disk structure. A failed update can result in data loss. Therefore, you must perform a full to an external drive. For additional safety, consider cloning your startup disk using software like Carbon Copy Cloner. Crucially, do not skip this step; Catalina converts the system volume to a cryptographically signed, read-only “Signed System Volume,” and while this usually works seamlessly, reverting is difficult without a backup.
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.
Catalina officially supports the following Mac models: how to update macos high sierra 10136 to 1015
Before you begin, you must ensure your hardware can handle Catalina. Generally, if your Mac was made in , it is compatible. MacBook: Early 2015 or newer MacBook Air / Pro: Mid 2012 or newer iMac: Late 2012 or newer Mac mini: Late 2012 or newer Mac Pro: Late 2013 or newer Step 2: Essential Pre-Upgrade Checklist
Updating from macOS High Sierra 10.13.6 to Catalina 10.15 is less about getting new features (like Screen Time or Reminders upgrades) and more about maintaining security and app support. While Catalina receives security updates (until late 2022, now obsolete), High Sierra is unsupported. However, the loss of 32-bit apps is a major trade-off. If your essential software is 64-bit and your Mac is from 2012 or later, the update is logical. If you rely on legacy software, consider staying on High Sierra or jumping to a middle ground like , which still supports 32-bit apps. Always remember: a complete backup before any OS upgrade is your safety net. Proceed with knowledge, not just enthusiasm.
macOS Catalina only runs 64-bit applications. High Sierra can run both. If you rely on older software (e.g., old Adobe CS6, some games, legacy utilities), they will break. Stuck at version 10
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)
Do not skip this step. Upgrading across two major generations of operating systems alters your drive's file system structure. A sudden power loss or installation error could result in permanent data loss. Connect an external hard drive to your Mac. Open from your System Preferences. Click Select Backup Disk and choose your external drive. Turn Time Machine on and select Back Up Now .
The install may take 30–90 minutes. Do not close the lid or turn off your Mac. Therefore, you must perform a full to an external drive
Search for "macOS Catalina" in the App Store.
This report outlines the necessary steps, prerequisites, and important warnings regarding the upgrade from macOS High Sierra (10.13.6) to macOS Catalina (10.15).
