@tig said:

Download the latest version from the sketchup.com site... http://www.sketchup.com/intl/en/download/
The current Pro version is as the attached screen-shot.
The Free version is similar...

It works! -:)
Thank You

@gaieus said:

What version of SU do you have? (It needs the latest, SU 8 version - Pro or Free, does not matter)

8.0.4811 Also strange, if a ask to check for updates, I get "Sketchup was unable to obtain the latest version information"...

Thanks for your help

The "Install Extension" option is missing in my System preference...?