QuickBooks Error 1402 can appear when installing or updating QuickBooks Desktop if the installer cannot access or modify a required Windows registry key or system component. Users may see the error while the installation is progressing, after an interrupted installation, or when Windows permissions prevent the installer from making required changes.

Start by restarting Windows and running the QuickBooks installation again. Make sure you are signed in with a Windows account that has administrator privileges. It is also important to check whether Windows has pending updates, because outdated or damaged Windows components can interfere with software installation.

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