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I have downloaded DAZ and have played around with it.  I have purchased various items such as clothing and characters (the Victorias). The clothing and items I have downloaded do not seem to work properly and some do not work at all. I have downloaded these from the DAZ store itself so it is puzzling why they do not function. I am sure there is some tweaking that can remedy this BUT......

It depends on what sort of not working, but one common problem is tying to apply materials, which change the appearance of the clothes once they are loaded and selected, instead of loading the clothing. You may even have a set which is purely materials, requiring another product (which should be listed on the product page) for use.