Bear with me, I'm not on my normal pc so I'm running on my aging memory! 1. When you have poser loaded, click on one of the library options, 'figures' for example. 2. Press the folder with the arrow on it, this will take you to the runtime menue. (You should see 'poser 5' with a red dot, and a folder called downloads.) 3. Press the + at the bottom of the column, (Just like adding a new pose to your library). This will allow you to browse to your new runtime folder. 4. Once you have found your new runtime folder, select it, and it "should" appear in your runtime library as you currently selected runtime. Now you can choose which runtime to work with. When you need more runtimes, just do the same steps. Hope this helps, and I hope I haven't missed anything. (I have 6 runtimes!)