Mr Buffy

I've been using my Poser 6 runtime without any troubles. And it has some content from Poser 4. I hope that helps.

 I understand that. But I've been basically using the same Runtime since Poser 5- expanding it and  adding to it as I went along. I already have things set up and arranged the way I want them. So when I get a new program, I change out the Runtimes- and then add in the new content from the current program.