Hi there,
I also have problems installing the plugin, after I read here there is a different way to do it for SU2014, so I tried it this way.

C:\Users<YourUserName>\AppData\Roaming\SketchUp\SketchUp 2014\SketchUp\Plugins\

But apparently my computer doesn't have AppData, it has Roaming but that file is empty.

Can someone help me with this problem?
Is there an other way?

Also I have windows 8, I don't know if that change things.

I really hope someone can help me because I really need it, it would be sad that I just upgraded my SU and won't be able to use KT.

Thanks!