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Are there any other rb files in this folder? By default there should be a couple of rb files and some folders.
I have all of the hangar, hangar1, 2 and 3 installed. When I run the Plugin it says there is a later version available. Is the hangar dev.zip on the first page the latest? How do I install the hangar dev.zip files? Do I just allow all of them to overwrite the older version files? I see a lot of new files that were not in the original version. I read somewhere in this thread that there was an option to use ft instead of cm. Does the dev version include this option? Sorry for all the questions but I am new to Sketchup. Bob.
For SketchUp 2014 and SketchUp 2015 the Plugins folder has to be in %AppData%\SketchUp\SketchUp 2015\Plugins\ folder (e.g. c:\users\<username>\AppData\Roaming\SketchUp\SketchUp 2015\Plugins\) and not under c:\program files\. Could you try to move the files to this folder and see if they appear in SketchUp?
Also, this may be a stupid question, but did you restart SketchUp after downloading the latest script files?