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Gabriel Scholz
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November 15, 2026 at 12:23 am in reply to: [Solved] Mac mini M2 encountering macOS Installer Error: ‘An error occurred preparing software update’ after update (macOS Sonoma 14.6) #15481
Gabriel Scholz
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 15″ M2 (16GB) | Glyph Atom Pro 2TB | iPhone 16 Pro Max | Ottawa, ONApple Certified Support Professional (ACSP) | Commercial Photographer & DigitechGabriel Scholz
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Reinstalling Rosetta 2 runtime daemon and rebuilding LaunchServices database.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Force reinstall Rosetta 2:
softwareupdate --install-rosetta --agree-to-license - Reset LaunchServices database:
/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user - Kill daemon to rebuild fresh cache:
sudo killall -9 oahd
Following this procedure restores full stability with zero recurring log errors.
MacBook Air 15″ M2 (16GB) | Glyph Atom Pro 2TB | iPhone 16 Pro Max | Ottawa, ONApple Certified Support Professional (ACSP) | Commercial Photographer & Digitech - Purge update caches:
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