I downloaded, but have not yet installed the demo. Does anyone know what ramifications there are of installing it? Namely, it says you can't render, nor save files. Does this mean I will lose the ability to render and save files from Poser also? I would hope not, but I thought I would check before installing. Thanks.

No, you can install the demo in a different folder and then it dosen't affect your normal Poser. I'm not sure if the demo associates itself with the pz3 extension. If it does you can link this extension back to Poser 4 with the folder options of the explorer.

I installed the Demo and used it once before I had to install a new HD...now I haven't installed it again yet, but I remember it was a stand alone program separate from Poser 4...my question is...if I buy Pro Pack is it a stand alone that I use INSTEAD of Poser 4..then can I uninstall Poser 4? Thanks!

Actually, I think even I can answer this one! LOL. No, Pro Pack is not stand-alone. You need the Poser program also. Curious Labs wouldn't be selling very many Poser programs since the Pro Pack is the same price as Poser. The demo, which I did finally install, comes with the demo of Poser as well, which is why you could use it in another directory seperate from your regular Poser.