Hi Awais,
A search brought me to this thread. We are having the same issues with the XPS Print API and Windows 8.1. For anybody else landing here there is a FixIt from Microsoft that gets this working on Windows 8.1 here:
http://support.microsoft.com/kb/2954953/EN-US
I’m also glad to hear that Aspose is committed to a solution going forward when XPS Printing has been completely removed from Windows. Is there an official statement from Aspose to that effect?
Thank you.