Hi Mike, thanks for your suggestion.
My Sketchup is still working very well, even with this "plugin" folder missing. Reinstalling the whole thing seems like a tedious thing...
My guess is that Sketchup 8 Pro may not be working with a plug-in folder, instead it may be working with the
Sketchup - Preferences - Extensions - Install extensions, only. However, the plug-in that Honolulu kindly shared is a "rb" file, which the Sketchup 8 Pro does not open (opens rbz).
Any other ideas?
Thank you again,