When you unzip it, you should get 2 files: a Vise installer and a readme. There is no need for another installer if these are from DAZ, because all of their products come packaged to install properly. You use "mermaids" in the plural. Are you sure that these are from DAZ? They did a mer-family quite a while back, now reduced in price, and have offered some new ones based upon Victoria and her younger self. However, dcort has also done mermaids, in the plural, of various sorts (1- and 2-tailed). His would be zipped, whereas ones from DAZ are .exe or .sit in compressed format. Carolly