Overgrowth Downloader must be used you use in conjunction with Overgrowth in order to correctly list the available moods and to allow you to install them into the correct folder, with just a click.
When you first start the application you will be asked where your Overgrowth Data folder is located. Using the window that pops up you need to choose the Data folder. It is located in the root folder of Overgrowth.
Note: The application is cross-platform and it runs on Windows XP, Windows Vista, Mac OS X and Linux.