Hmmmmmmmmmm... It's been discontinued here, and unless you're able to find it on ebay, you'll probably just have to get hitfilm and a new graphics card. sorry
bytheway, if you do decide to get a new graphics card, be careful. i got a new one so i could run the hitfilm demo, and it turned out that it still wasn't powerful enough, because it was the wrong product from a company that makes graphics cards that ARE powerful enough. read the hitfilm specs verrrrry carefully, and you won't make the same mistake i did.