By way of experiment, I made new windows user named alphabetical, and I newlly installed libfredo. then my probrem on this plugin was solved, It seems to be work well.

Sorry for my impatience and Thanks for wonderfull plugin...

Hello,

V8.4g didn't work well in my pc too.
My sketchup versions are 2018pro and 2014pro, and both of them don't work well.

This is error message. Sorry for two-byte text for I use Japanese version....
First line is just noticing error.

Fredo6_!LibFredo6.rbファイルをロード中にエラー発生
Error: #<ArgumentError: invalid byte sequence in UTF-8>
c:/users/美穂子/appdata/roaming/sketchup/sketchup 2018/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:43:in gsub' c:/users/美穂子/appdata/roaming/sketchup/sketchup 2018/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:43:in get_dir_from_ENV'
c:/users/美穂子/appdata/roaming/sketchup/sketchup 2018/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:405:in dir_appdata' c:/users/美穂子/appdata/roaming/sketchup/sketchup 2018/sketchup/plugins/fredo6_!libfredo6/top_libfredo6.rbe:204:in startup'
C:/Users/美穂子/AppData/Roaming/SketchUp/SketchUp 2018/SketchUp/Plugins/Fredo6_!LibFredo6.rb:63:in process' C:/Users/美穂子/AppData/Roaming/SketchUp/SketchUp 2018/SketchUp/Plugins/Fredo6_!LibFredo6.rb:70:in module:LibFredo6_Loader'
C:/Users/美穂子/AppData/Roaming/SketchUp/SketchUp 2018/SketchUp/Plugins/Fredo6_!LibFredo6.rb:28:in `<top (required)>'

I wondered that this occurs because of my two-bite code user dir name(which automatically named when I installed win10),
but when I use older version libFredo, This problem didn't occur.

Does this helps you?