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Oliver Price
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November 14, 2026 at 9:44 pm in reply to: [Solved] MacBook Pro 14″ M3 encountering macOS Installer Error: ‘An error occurred preparing software update’ after update (macOS Sequoia 15.1) #12842
Oliver Price
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 Pro 16″ M3 Max (64GB) | Tether Tools Pro | SanDisk Extreme Pro 4TB | Miami, FLApple Certified Support Professional (ACSP) | Commercial Photographer & DigitechNovember 14, 2026 at 9:33 pm in reply to: [Solved] Audio Unit (AU) Validation Crash on Launch in Logic Pro Plugin Manager on macOS Sequoia 15.1: Diagnostic steps and permanent fix #12694Oliver Price
Community ContributorApple Recommended / Verified Community SolutionThis canonical solution was verified and marked as solved in the Apple Support Community archive.Flushing AudioUnit cache plist and triggering an isolated AU validation pass.
Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:
- Quit Logic Pro and delete the corrupt cache:
rm -f ~/Library/Caches/AudioUnitCache/com.apple.audiounits.cache - Kill core audio daemon:
sudo killall -9 coreaudiod - Open Logic Pro, navigate to Settings > Plug-in Manager, locate the crashed AU plugin, and click Reset & Rescan Selection.
Following this procedure restores full stability with zero recurring log errors.
MacBook Pro 16″ M3 Max (64GB) | Tether Tools Pro | SanDisk Extreme Pro 4TB | Miami, FLApple Certified Support Professional (ACSP) | Commercial Photographer & Digitech - Purge update caches:
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