It sounds like things are working ok now? Don't worry about png files if they came with a download. Many artists have Poser Pro pack and routinely give us stuff with the png files. Poser 4.03 won't use them, but it won't choke on them either. If you don't have rsr files, you won't see the icon in your library. You'll see that shrugging guy. Just load the item, then resave it to the library to get the rsr thumb.