The download file is roughly 8 GB. Once completed, the installer will automatically launch on your screen, titled Install macOS Catalina . Click and follow the onscreen prompts.
Follow the on-screen instructions to begin the installation.
Common issues and fixes
Once you're logged into Catalina, a few steps will help you finalize the transition.
If your Mac hangs on the progress bar for more than two hours, a background process may be frozen. how to update macos high sierra 10136 to 1015
Updating from High Sierra to Catalina is a straightforward process via the Mac App Store, provided you have verified hardware compatibility and backed up your data. However, the loss of 32-bit app support makes this a "point of no return" for users reliant on older software.
Your Mac will begin preparing files and will eventually restart.
The screen will go black, display the Apple logo, and show progress bars multiple times. The computer may restart on its own several times. This process typically takes between 30 to 45 minutes to complete. Phase 4: Post-Installation Setup
Upgrading from High Sierra 10.13.6 to Catalina 10.15 is a major leap that breathes new life into older Macs – but only if you prepare. Follow this guide carefully, and you will have a stable, modern macOS environment ready for the next few years. Good luck! The download file is roughly 8 GB
Before any major upgrade, perform a full backup using Time Machine to an external drive. This ensures you can revert to High Sierra if the upgrade fails or if essential apps are incompatible. Step 4: Download and Install Catalina
Type your administrator password if prompted.
Your Mac will restart to begin the installation process. The screen may go black or show a progress bar for up to an hour. Do not close the lid or unplug your machine during this time. Troubleshooting Common Upgrade Issues "Installation Failed" or Gateway Errors
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. Follow the on-screen instructions to begin the installation
Check the box for and click Back Up Now in the menu bar icon to complete a fresh backup. 3. Clear Storage Space
macOS Catalina (10.15) runs on these Macs:
"Easy enough," Elias muttered. He opened the System Preferences pane, expecting to see a "Software Update" button that would whisk him away to the newer version.