How to get Adobe Photoshop Elements 6.0 TRIAL VERSION?

I lost the CD but I have the serial number. All the sites lead me to Adobe's site, which only has the 9.0 trial version. I need 6.0! Anyone know where I can find it? :( Yeah, 6.0 is the old version but I paid $100 for it a couple years ago and I hardly used it. I want to start using it again.