I am also failing to load on start up. I get:
Error Loading File C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon/GcodeImporterVer0.0.8.rb
Error: #<SyntaxError: C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon/GcodeImporterVer0.0.8.rb:38: formal argument cannot be an instance variable
@filamentComp.entities.each { |@ent|

                                       ^

C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon/GcodeImporterVer0.0.8.rb:163: formal argument cannot be an instance variable
IO.foreach(filename) do |@line|

                                ^

C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon/GcodeImporterVer0.0.8.rb:183: formal argument cannot be an instance variable
@params.map {|@var|

                        ^>

C:/Program Files (x86)/SketchUp/SketchUp 2014/Tools/extensions.rb:197:in require' C:/Program Files (x86)/SketchUp/SketchUp 2014/Tools/extensions.rb:197:in load'
C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon_GcodeTools_ext.rb:40:in register_extension' C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon_GcodeTools_ext.rb:40:in loadLastVer'
C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon_GcodeTools_ext.rb:47:in <module:Fishelzon>' C:/Users/Pop/AppData/Roaming/SketchUp/SketchUp 2014/SketchUp/Plugins/Fishelzon_GcodeTools_ext.rb:11:in <top (required)>'

Any resolution?
sketchup 2014 Win 7 x64

Thanks
Bruce