Ok well perhaps if he is stuck for a driver for the 460 cos the demo needs cuda 3.0 he can it try out on a friends computer with a different card.
People can refer to the videos to get an impression of Octane in use if they are really stuck.
http://www.refractivesoftware.com/videos.html
He should know the latest commercial beta runs fine on a 460 with the drivers that are available.
Its just a bit of an unfortunate situation that the 460 has come out after the demo was developed and the cuda version has moved on
Sorry I cant do more than that for you bariscan90. Hope you arent put off by the small gotcha with the demo. I dont think you would be disappointed if you bought a license now anyway just on the basis of what you can see and also hear from other users.