How to capture screenshot?
 

I tried the "PrtScr" key but the captured screens aren't anywhere to be found. I've also tried alt+tab and pasting inside a paint program, but got a pic of my desktop instead. Please help me on this one, thanks!

Better to use some free programs for that, like FRAPS.

The screenshot from Print Screen button "PrtScr" are to be found:

My Documents/My Games/King's Bounty/Screenshots
(if you run demo it would be : My Documents/My Games/King's Bounty Demo/Screenshots... but I am not sure if KG tL Demo supports screenshot making in the same extend)
also are in memory:

open any picture editing programs (Paint in Windows, but even cheap Photoshop 7.0 will do), click "NEW" and press CTRL+V (or CTRL+v ... as maybe some other oldscool detailist will press ctrl+shift+v when seeing CTRL+V :( )

If Screenshots folder dosen‘t exist，You need create it manually or it will fail but the game still tell you success.

Push the F12 key. It saves a picture as a .bmp file to following installed folder
Cryostasis\Data\Save. it saves named "current".if you push more it saves only the last moments screen.