Locked groups move?

Aureus

@aureus said:

.... No way through Windows Explorer like in old good times?

Security measures, I guess...

This may help you finding plugins in newer (SU-2014 and 2015) versions:
http://help.sketchup.com/en/article/38583

Thank you, Gerrit!

This is what I've been searching for.

There it is:

SketchUp 2014:
C:\Users\YOUR USERNAME\AppData\Roaming\SketchUp\SketchUp 2014\SketchUp\Plugins

I don't know why it's there but at least I don't have to start the program in order to meddle with the Plugins folder. Now I can finally make a mess again with no much effort.