The demonstration code at on this page shows that a pdf can be saved as a TIFF using Aspose.PDF.
https://products.aspose.com/pdf/net/conversion/pdf-to-tiff
// load the PDF file to be converted
var document = new Aspose.Pdf.Document("My File.pdf");
// save PDF as a TIFF
document.Save("Saved File.tiff", Aspose.Pdf.SaveFormat.Tiff);
However, when I try to recreate that code, the TIFF enum does not appear to be available. What am I missing?