I think you'll find the current version of Poser quite familiar if you're used to Poser 4. The interface is basically the same. There's the Hair Room and Cloth Room (introduced in Poser 5), but you don't have to use them. The Materials Room is much more advanced, but you have the option of using the Simple version, which is much like Poser 4.

You can try it for free for 21 days. Give it a shot. Flash will be a never ending headache with older versions of Poser.