I bought the Poser 5/ Poser 6 special (downloadable version, tho) and Poser 6 installed in it's own directory, not over the top of Poser 5. So I have both versions on my PC now. The Poser 6 version was labelled (at least on the download page) as an Upgrade, but in reality it appears to be a full version. As far as i know (I might be wrong about this tho) some of the content will only be included in the SE version and won't in the normal full version (such as the winter queen stuff).