Purchasing iOS 3.1 SW Update for iPod Touch Gen 1

[Seece]

Ok this is causing me a real headache.

I want to buy the SW that allows me to play games like Angry Birds and Fruit Ninja on my 1st Gen Touch, but I need to buy this SW, Fine.

http://support.apple.com/kb/HT2052 (Purchase the iOS 3.1 Software Update directly from the iTunes Store.) - 'It's supposed to send me to the itunes store.

However EVERY time I click the link, it just links to me to a page to download Itunes 10, which I've already done. This is the same in firefox and IE and I have pop up blocker turned off.

Not sure if this is more Mobile or PC but I'll put it in here, any help appreciated!!