Hi Didier,
thanks for your message, very kind indeed!
When uninstalling Sketchup I realised I had been putting all my plugin's into a different SU folder, namely directly into the SU folder from my Applications shortcut. I guess I had added a Plug-in folder when not seeing one there, silly me.
I then went to the original folder through app support and realised where they were supposed to go.
Beginner Mac mistake I guess.
Many thanks again for your help.
It works like a charm now!!!
I ended up using the Triangulate rb. I use the TIG's to make a DTM (digital terrain model) for landscape design, rendering it with my drawings and then adding 3d features which I'll then make 3d sketches of as I still don't think SU does the job for presentation quality landscape design. just still feels too cheap.
See below: