I purchased 4.5, but need the last version instead.

I've been using the demo version of C 1-4 since the beginning of October, and decided last nite (at 3 a.m.) to purchase it. I saw that instead they had 4.5 and read the release notes and stupidly, thought it said Mac 10.4 and later. So I went ahead and bought, it dumped the old version and loaded the new version and of course it work. Is there any way to download the older version. I don't really want to get Leopard at this time. Any help would be appreciated.

Regarding the product itself, my decision was based on seeing a demonstrative qualitative difference in raw files from my digital work flow. Anyways.....Help!!

UPDATE
OK never mind the above, I found the former versions section on the site map, swapped out and the license key automatically transferred back, so looks like its all good. Sorry to disturb