download from this site (http://sketchucation.com/pluginstore?pln=LibFredo6) and then install via dialog System Preferences -> Extensions -> Install Extension.

information from About dialog

INFORMATION
Plugin Subfolder = Fredo6_!LibFredo6
Plugin Root Directory = C:/Users/xxx/AppData/Roaming/SketchUp/SketchUp 2015/SketchUp/Plugins
Default Parameters Directory = z:/LIBFREDO6_DATA_Dir/DefaultParameters
Temporary Files Directory = z:/tmp

what i can change Default Parameters Directory ?

Error with the location of the directory LIBFREDO6_DATA_Dir (on root drive instead catalog on this drive) has been going on for a long time. Is there a chance to solve it? Garbage in the root of drive is not very happy.