How To Update Macos High Sierra 10136 To 1015 Jun 2026

Catalina requires at least , but 30–40 GB is safer.

If using a laptop, plug it into a power source during the update. Step 2: Essential Pre-Update Checklist

If you’d like, I can:

"This copy of the Install macOS Catalina application is damaged" how to update macos high sierra 10136 to 1015

Once the download finishes, an installer window titled will automatically launch on your desktop.

and agreed to the Terms and Conditions (the fine print of the digital realm). They selected their main hard drive and entered their Administrator Password to grant the installer the power to change the system.

: Use the built-in Time Machine utility to back up your files to an external drive. Catalina requires at least , but 30–40 GB is safer

, refreshed and ready for modern adventures. A lonely folder called "Relocated Items"

Click or Get . This will open the Software Update pane in your System Preferences.

Do not touch power, do not force shut down. If stuck on a progress bar for over 2 hours, then troubleshoot (see Step 6). and agreed to the Terms and Conditions (the

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Since you are on High Sierra, the update may not appear automatically in "Software Update." You should use the method: Updating and Upgrading macOS High sierra - Apple Community

If you encounter issues during this process, let me know the or any specific error messages you receive so we can troubleshoot further. Share public link

Click and enter your Mac’s administrator password. Step 4: Wait for Completion