Looks like you're out of luck, as NVidia India says here:
http://in.nzone.com/object/nzone_cry...nloads_in.html
"Cryostasis PhysX Patch for EU boxed versions" - and India is hardly a part of EU nowadays *smirk*. But given that Cryostasis came out in India several months later than in Europe, this patch might also be part of your game already.