Preloading games off Steam - How Do???

I preordered the Witcher 2 off Steam and I wanna preload it but don't know how. Its on my games list in my Library but when I R Click it it doesn't gimme the option to preload. I couldn't find the option for FO:NV either but one of you guys linked me to the preload page and it worked fine. How do I preload Witcher 2? Thanks...

Not all games you can preload, only ones that say so.

The Witcher2 as far as I know if only preloadable on GOG.com, that might change though, hopefully steam allows it to.

Games like BRINK, Dragon Age2,etc.. let you preload but some dont let you have that option.

You can't preload every game.

For The Witcher 2, you can only preload it if you bought it from GOG.com (http://forums.steampowered.com/forums/showthread.php?t=1833767)

Steam will let you know what and when to do, just check back with your steam account regularly.

You can preload it only on GOG.com .. for now . i already preloaded my copy (9.6gb for the game alone ) and i got Gothic 2 for free .