…had to share this with you that I ran into when trying to install Visual Studio SP1 on Windows 2003 Std – why did the patch fail? It was too big! haha
Install this update to resolve an issue where you receive a digital signature policy error message when installing a large Microsoft Windows Installer (.msi) package or a large Microsoft Windows Installer Patch (.msp) package.
Further information is here:
FIX: Error message when you try to install a large Windows Installer package or a large Windows Installer patch package in Windows Server 2003 or in Windows XP: “Error 1718. File was rejected by digital signature policy”