Mac SU16: ~/Library/Application Support/SketchUp 2016/SketchUp/Plugins Mac SU15: ~/Library/Application Support/SketchUp 2015/SketchUp/Plugins Mac SU14: ~/Library/Application Support/SketchUp 2014/SketchUp/Plugins Mac SU13: ~/Library/Application Support/SketchUp 2013/SketchUp/Plugins Mac SU8: Macintosh HD/Library/Application Support/Google SketchUp 8/SketchUp/Plugins The second installs only for the current user.) Windows SU216: There are 2: C:\ProgramData\SketchUp\SketchUp 2016\SketchUp\Plugins and C:\Users\your user name\AppData\Roaming\SketchUp\SketchUp 2016\SketchUp\Plugins (Twilight Render uses the first one which installs for everyone who uses the computer. Windows SU15: C:\Users\\AppData\Roaming\SketchUp\SketchUp 2015\SketchUp\Plugins Windows SU14: C:\Users\\AppData\Roaming\SketchUp\SketchUp 2014\SketchUp\Plugins Windows SU13: C:\Program Files\SketchUp\SketchUp 2013/Plugins
Windows SU8: C:\Program Files\Google\Google SketchUp 8\Plugins
The standard SketchUp Plugins root directories are: The directories for the various versions of SU plugins folders are as follows - try looking in these places: Are you sure that Kerkythea is installed to the proper file path?