Our .SIT installers for the MAC have two options: Easy Install and Extract Enstall. The Easy Install searches your hardrive for the PoserTM folder and installs the files in the proper subdirectories. If your Poser Application is in a folder named something different than PoserTM or PoserTM4, the Easy Install option will not work. The Extract Install option will extract all the files to a single folder in a location of your choice. Accompanying the Poser files is a ReadMe document that contains instructions on where to place each of the extracted files. You can use this option if the Easy Install option does not work or if you want to install the files somewhere besides the default locations.