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Judith Brooks
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November 14, 2026 at 10:53 pm in reply to: [Solved] macOS Installer Error: ‘An error occurred preparing software update’ on macOS Sequoia 15.1: Diagnostic steps and permanent fix #13940
Judith Brooks
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Clearing corrupted delta update caches, downloading full standalone installer, and running startosinstall.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Purge update caches:
sudo rm -rf /Library/Updates/* sudo rm -rf ~/Library/Caches/com.apple.SoftwareUpdate/* - Download full installer:
softwareupdate --fetch-full-installer --full-installer-version 15.1. - Execute terminal installer:
sudo /Applications/Install macOS Sequoia.app/Contents/Resources/startosinstall --agreetolicense --forcequitapps.
Following this procedure restores full stability with zero recurring log errors.
MacBook Air 13″ M3 (16GB) | Apple GSX Terminal | Thermal Camera Seek Compact | Vienna, ATApple Certified Support Professional (ACSP) | Apple Certified Service Technician (ACiT / ACSP)Judith Brooks
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Re-authorizing HomeKit location services and setting Find My primary device.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- On iPhone, navigate to Settings > Privacy & Security > Location Services > System Services and ensure HomeKit is enabled.
- In Settings > [Your Name] > Find My, confirm My Location says ‘This Device’.
- In Home app, tap Home Settings > Location Services and toggle off, wait 10 seconds, and toggle back on.
Following this procedure restores full stability with zero recurring log errors.
MacBook Air 13″ M3 (16GB) | Apple GSX Terminal | Thermal Camera Seek Compact | Vienna, ATApple Certified Support Professional (ACSP) | Apple Certified Service Technician (ACiT / ACSP) - Purge update caches:
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