From release notes:
PDFCreator 3.0 requires the .Net Framework 4.5.1 and therefore Windows Vista or above. Windows XP is no longer supported. If you need Windows XP support, please use PDFCreator 2.x instead.
http://docs.pdfforge.org/pdfcreator/latest/en/pdfcreator/introduction/whats-new/
PDFCreator will install if requirements are not met, but will error when running application. Can PatchMyPC detection account for .NET Framework 4.5.1 requirement? Application failures can be high if upgrading from older PDFCreator prior to 3.0 with .NET 4.5.1 or newer.
You are talking about SCUP Catalog right ?
Yes
It's fixed in yesterday's catalog update :)