You may receive this error message if any one of the following conditions is true: If you click OK in the message box, the installation rolls back. When you try to install a Windows Installer package, you may receive the following error message:Įrror 1603: A fatal error occurred during installation.
This article helps fix the error 1603 that occurs when you install a Microsoft Windows Installer package.Īpplies to: Windows 10 - all editions Original KB number: 834484 Symptoms