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Diane Cruz

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  • November 15, 2026 at 12:39 am in reply to: [Solved] Mac mini M2 encountering macOS Installer Error: ‘An error occurred preparing software update’ after update (macOS Sequoia 15.1) #15741
    Diane Cruz
    Senior Specialist (Lvl 8)
    Apple Recommended / Verified Community Solution
    This 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:

    1. Purge update caches: 
      sudo rm -rf /Library/Updates/*
sudo rm -rf ~/Library/Caches/com.apple.SoftwareUpdate/*
    2. Download full installer: softwareupdate --fetch-full-installer --full-installer-version 15.1.
    3. 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 (128GB) | SanDisk Professional G-RAID Shuttle 4 | Barcelona, ES
    Apple Certified Support Professional (ACSP) | Final Cut Pro / DaVinci Colorist & Editor
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