Well, I found loads of links to old versions, but if you don't actually have it, why would you want to buy a version that has had bug fixes and improvements done to it? Makes no sense at all. As soon as you install it, you'll no doubt be bombarded with "do you want to upgrade" boxes. So the short answer is simple - yes. if you want to faf around with versions less developed, sellers on ebay and keys.
The latest version isn't expensive - so what are you really after?