Any application marked with a is a 32-bit app and will not work on macOS Catalina. Make a note to update, replace, or find alternatives for these programs. Step 4: Back Up Your Mac
Before jumping in, recognize the crucial change: . If you rely on legacy software like older versions of Microsoft Office or Adobe Creative Suite, they will stop working after this update.
This long-form guide will walk you through every stage: pre-upgrade checks, data backup, compatibility verification, the actual installation process, and post-upgrade troubleshooting.
Upgrading your Mac from to macOS Catalina (10.15) is a major leap forward. This transition moves your system from an aging operating system to one that supports modern applications, enhanced security features, and a more streamlined user interface. how to update macos high sierra 10.13.6 to 10.15
The most important change in macOS Catalina is the . High Sierra was the last version of macOS to run 32-bit apps without restrictions.
is a significant transition that modernizes your Mac but requires careful preparation, especially regarding application compatibility. Apple Support Community The Verdict Performance
After the final reboot, you’ll see the Catalina setup assistant. Any application marked with a is a 32-bit
Known Catalina bug during firmware updates. Fix: Be patient – up to 2 hours. If still stuck, force restart by holding power button. Upon reboot, the installer often resumes correctly. If not, boot into Recovery Mode (Cmd+R) and re-run the installer.
Catalina only supports 64-bit apps . Older versions of Microsoft Office, Adobe Creative Cloud, and legacy drivers will stop working. Use a tool like Go64 to identify which of your current apps will break after the update.
Try opening an older app you thought was 64-bit. If it bounces and quits, check System Reports → Applications again. Some apps falsely reported “Yes” for 64-bit but still fail due to deprecated frameworks. If you rely on legacy software like older
Open your Safari browser and visit Apple’s official support page for downloading older versions of macOS, or use this direct link to open the App Store page: Get macOS Catalina on the Mac App Store. 2. Download via App Store
macOS Catalina requires Apple's newer, highly optimized format. Usually, the Catalina installer converts your solid-state drive (SSD) automatically. If it throws an error regarding your partition scheme, you may need to open Disk Utility , select your drive, and manually convert or reformat it (warning: reformatting erases data, so verify your backup first). "Installation Failed" or Gateway Timeouts