Alan,
How are the 'tutorials' or the add-ons suppose to be added to 'pro' version...
I.E. How or where am I suppose to unzip the files and set them up???
Dumb question, from an even dumber 'user'...
Ed -

After you have downloaded the "zip" file then open it and have a look for a readme file

This is a typical "readme"....

1) Copy the *.dll file provided in this Zip file to the 3D Canvas LP/Pro
  Plugins folder (usually c:\Program Files\3D Canvas\Plugins)
2) Run 3D Canvas LP/Pro.
3) The plug-in will be available and can be used by selecting tools/ use plug-in

if it is not a *.dll file but a *.cs file then this is a script and needs to go into the Scripts folder (usually c:\Program Files\3D Canvas\Scripts) and you will find these then in tools/ run script

Hope this helps..........