I and a lot of others use Poser 5 with Vue and do not have a problem. You should check which Vue 4 version you have. Poser 5 came on the market after Vue 4. Therefore the Poser 5 import was introduced in a later update only. AND, you maybe should rename your Poser 4 exe file so that Vue 4 asks again for the Poser application. Then you can point Vue to Poser 5 and should not have too many problems. If you want to import Poser animations (remember that dynamic clothes and hair are animations as well) you will need Mover 5. Oh, i am sure that Vue will deal with Poser 6. But to start the development Poser 6 must be on the market first. So that the features are clear.

One day your ship comes in - but you're at the airport.