Well, this is clear in a way. If you look into a pz3 file - i think everybody should do that maybe once in their lifes - you will see that the pathnames are not complete. They start with "Runtime:..." So a program liek Vue needs to know where this Runtime is located. This is a major reason why we all have to point Vue to the related Poser installation - so that it is clear where the Runtimes are.

Now when you point Vue to a Poser version that has not written the pz3 Vue of course will look in a wrong place - and then asks that you help a little in the work of identifying the correct elements.

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