Extension for the Suite you downloaded...ie: Thunderstorm.??? , Alien.??? ...??? should be '.suite' ext. You can make the extensions visible in Control Panel/Folder Options/View...un-check 'Hide Known File Extensions'. If it's not the correct ext then right click on downloaded file and hit 'Open with' and point to C:\Program Files\Stardock\Object Desktop\ThemeManager\ThemeMgr.exe. You get the beta version in SDC...make sure in settings you have checked to 'show pre-released versions'........