Upgrading from High Sierra 10.13.6 to Catalina 10.15 is a feasible but increasingly obsolete upgrade path. Users should prioritize checking 32-bit app compatibility, backing up data, and verifying hardware support. For most Macs that support Catalina, upgrading to a newer, still-supported macOS version is strongly advised unless legacy 32-bit software requires Catalina as a final compatible OS.
End of Report
Upgrading from macOS High Sierra 10.13.6 to macOS Catalina 10.15 is a major jump that replaces outdated system structures with modern features like dedicated media apps and iPad screen sharing. Key Benefits of Upgrading
Modern Media Apps: Catalina replaces iTunes with three dedicated apps: Apple Music, Apple TV, and Apple Podcasts.
Sidecar: You can use a compatible iPad as a second display or high-precision input device for your Mac.
Improved Security: Includes Find My (which works even if the Mac is offline) and Activation Lock for Macs with the Apple T2 Security Chip. how to update macos high sierra 10.13.6 to 10.15
Screen Time: Brings the iOS feature to Mac, allowing you to track app usage and set limits. Critical Requirements & Preparation
Before you start, note that Catalina does not support 32-bit applications. Apps like older versions of Microsoft Office or Adobe Photoshop will stop working. macOS - How to Upgrade - Apple (SI)
Moving Forward: How to Upgrade from High Sierra (10.13.6) to macOS Catalina (10.15)
Upgrading from macOS High Sierra 10.13.6 to macOS Catalina 10.15 is a significant jump. It moves your Mac into a modern era of features like Apple TV, Podcasts, and enhanced security, but it also marks the end of support for older 32-bit apps. Follow this guide to ensure a smooth transition. Step 1: Check Compatibility
Before you start, verify that your Mac hardware is officially supported. Catalina generally supports most Macs from 2012 onwards. Apple Support How to Update Mac to 10.15: A Step-by-Step Guide Upgrading from High Sierra 10
To update macOS High Sierra 10.13.6 to macOS Catalina 10.15, you must first verify that your hardware is compatible and then download the installer from the Mac App Store. Because 10.13.6 does not always show Catalina in the standard "Software Update" menu, manual download is often required. 1. Verify System Compatibility
Your Mac must meet specific hardware requirements to run Catalina. Generally, models from mid-2012 or later are supported: MacBook: Early 2015 or newer MacBook Air: Mid 2012 or newer MacBook Pro: Mid 2012 or newer Mac mini: Late 2012 or newer iMac: Late 2012 or newer iMac Pro: 2017 Mac Pro: Late 2013 or newer Technical Requirements:
Stuck at version 10.13.6, need 10.15. Not… - Apple Community
Before doing anything, confirm your Mac can run Catalina.
Compatible models include:
Important: Catalina drops support for 32-bit apps. Go to Apple Menu > About This Mac > System Report > Software > Applications. Look for the “64-bit” column. If any critical apps say “No,” they will not run after the update. This includes older versions of Microsoft Office, Adobe CS6, and many games.
Catalina does not support 32-bit applications. Period. If you have any old software from 2015 or earlier that hasn’t been updated, it will simply refuse to open after the upgrade.
How to check for 32-bit apps on High Sierra:
Common 32-bit casualties:
Action Plan: Find 64-bit replacements before upgrading, or accept that you’ll lose access to those apps. If you rely on any legacy 32-bit apps, do not upgrade to Catalina – stay on High Sierra or Mojave. Before doing anything, confirm your Mac can run Catalina
Cause: Spotlight or Time Machine local snapshots.
Fix: Run tmutil listlocalsnapshots / in Terminal, then sudo tmutil deletelocalsnapshots / to purge them. Reboot.