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Error 1603: "A fatal error occurred during installation or updating"

SOLVEDby TurboTaxTurboTax Windows73Updated July 27, 2021

This error can occur when the Microsoft .NET Framework Installer can't install and/or update your system. Possible causes include:

  • Damaged Windows file and folder permissions
  • Damaged Windows Registry key permissions
  • Damaged Microsoft .NET Framework installation


If error 1603 occurs while updating TurboTax, download and install a manual update.

If error 1603 occurs while installing TurboTax (or in other situations), it may be related to the .NET Framework. See Troubleshooting problems with the Microsoft .NET Framework for more help.

Note: We suggest using Windows Update to ensure that your operating system is up-to-date, as this may resolve error 1603.

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