I haven't bought that many items from the store, but any seller that puts up stuff that goes in more then one folder in Poser without some kind of installer, or a system, AND instructions shouldn't be selling. When I first started downloading Poser items I noticed some were placed in the same folder names that Poser uses, with folders inside that, staring with a "runtime" folder. I just used those as a guide to placing the files, it didn't occur to me untill much later that if you Unzip to the Poser 4 folder all the files automatically go untill the right places- I never saw that in a read-me, but that is how it works. This is the simplest installer, it works on Macs too, and it is the one that I use. Only I include a Read-Me-First file to give some instruction, as well! This way you can install a new item in seconds, some don't trust the Zip to not overright existing files, but if you do it works well.