Basically, what I advise is this: 1.) Create a folder that will hold your new Runtime. Let's call it Mike3. 2.) Run Poser, then hit the "up" arrow till you get to the point indicated in the screenshot. Note the red ball by one of the Runtime folders. 3.) Now go to the bottom, and click the "+" sign, and add your Runtime from there. 4.) You can now install new stuff into the Mike 3 Runtime if you wish.