Is this a pay feature? Do I get any free downloads for purchasing a product?
Actually, you get a certain amount without buying a thing. Only Master skins, of whatever gallery has a charge. You should normally be able to download whatever you wish, barring the occasional hiccup from WinCustomize. At the moment, their does seem to be something wonkier than usual afoot. Give IE9 a try if on Win7. If not, try logging off, clear your cache and cookies and try again.