In most cases, you may encounter the Error 1603 when the installation location is not available. Use the following methods to fix the Windows installer error 1603: Method #1: Change the Installation Location There could be other reasons depending on your system or device. Note: The causes of Installation Error 1603 mentioned in this list are not the only ones they’re just the common ones reported by many users. When you don’t have the Full Control permissions of the System account or destination folder where you’re installing the Windows Installer package.When the destination folder of the application (Windows Installer Package) you’re trying to install is encrypted.When the drive containing the destination folder of the Windows Installer package or any other application you’re installing is accessed as a substitute drive.When Windows Installer is trying to install a Windows application that already exists on your computer.When the Error 1603 occurs, it mostly indicates that one of the common custom actions in the MSI failed. Once the error occurs, if you click the OK message box, you’ll notice that the installation rolls back. “Error 1603: A fatal error occurred during installation.” When the installation error 1603 occurs, it appears with a message displaying: Meanwhile, other users said they met the error during the installation of Google Backup and Sync on Windows 10.

Most of them reported that it might have to do with the Windows Installer package. Method #5: Install the Package into a Drive that Is not Accessed as a Substitute Drive Symptoms of the Installation Error 1603Ī number of users report encountering the Error Code 1603 when they try to install something on their Windows OS.

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