Thanks for your reply jepfree.

I have the free version, (Google SketchUp 6)

Surprise,surprise, the plugins where all freebies.
What I did do was open the zip files with Winzip, then dragged them into the plugins file. They seem to be working.

I have now un-installed Winzip, and installed ZipGenius.

Thanks again for your help and time.
ATB, Gary.