The FredoScale.rbz file from the SketchUcation PluginStore.
If you’re using SketchUp 2013 because it’s all your hardware supports, consider upgrading to a newer free version like SketchUp Make 2017 (discontinued but still usable) or the web-based SketchUp Free, then check for compatible free scaling plugins. fredoscale plugin for sketchup 2013 crack best