Verify Windows Permissions
Ensure that your Windows user account has sufficient privileges to install updates:
Log in as an Administrator and attempt the update again.

Switch to Selective Startup
Perform the update in Selective Startup mode to avoid background processes interfering:
Press Windows + R, type msconfig, and hit Enter.
Under the General tab, choose Selective Startup and uncheck Load startup items.
Go to the Services tab, check Hide all Microsoft Services, and then click Disable all.
Restart your computer, and try the QuickBooks update again.
By following these advanced troubleshooting methods, you can resolve persistent QuickBooks Desktop update errors effectively.

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