I am using the following code below to convert PDF files to postscript for one of our internal applications and occasionally we will get a customer file that converts but does not look right in the postscript version. I was using v8.20 of Spire.PDF and tried 8.60 and got same result. I attached the resulting postscript file put was unable to attach the original pdf file as it is just over 2mb zipped.
PdfDocument theDoc = new PdfDocument();
theDoc.LoadFromFile("2211955473001.1.Out.pdf");
theDoc.SaveToFile("out.ps", FileFormat.POSTSCRIPT);