Install Error

[Unholynight]

I downloaded Cryostasis through nvidia with my new eVGA 285gtx. When i go to install the game it comes up with an error saying that i needed to insert disc 4. When i check the folder which i downloaded Cryostasis to i notice that the file setup-4.bin is missing. I would download it again but my im getting rather close to my internet quota and to do so would mean i would have to download the other 2.3gb of game with it.