http://www.sketchup.com/download/all

I've had sketchup on my computer for years but never could understand it.  Finally found a short clip that made sense to me.  But my sketchup says I need to update and when I went to the above address from sketchup I don't understand which one to download.

I don't want to lose what I have, it does work but it appears that there are a few new tools.  I thought the pro version was one you had to purchase.

I just want to experiment with it building some furniture for myself, not go into another business.