Hi L13RAF!

In conversing with CL about DAZ character compatibility, here is what they said about upgrades to P6:

"The Poser 6 upgrade installs a whole new application- it doesn't change your existing Poser 5 application at all. Like Poser 5, Poser 6 can use multiple Runtime folders, so you can link your Poser 4, 5, etc. Runtimes into your Poser 6 Library palette and use that content without altering anything in those applications. This also allows you to remove or reinstall Poser 6 without affecting any other installed versions of Poser, or their Runtime folders."

This tells me that I can run P4,5 and six at the same time. By ordering P6 upgrade, you are really getting a discount for being a Poser user. It doesn't change P4 into P6. Hope this helps!