Tarnicus: Yup! You go to My Account > My Shelf (or My Games) > Click "Download installer"
You'll see this progress bar come up, very similar to the game we are playing now on the forums except this is a single player version of it. Instead of watching the copies remaining counter decrease and having enjoyable conversation on the forum, the single player version of this game has you watch the downloader progress. Obviously you get FAR more value for money out of The Witcher 2 (15.2GB) than say a classic like Ultima 7 (30MB) but one can throttle downloads to slow them and get a lengthier more in-depth gaming experience.
Personally I prefer the online version with social interaction. But what are you going to do when you don't have access to the internet? Play the single player and download! (unless you get the 'always online DRM version which actually FORCES you to connect to the internet to play!@!)