This is an old revision of the document!
Productivity Plus is another name for Renishaw Probe (Probing). It can only be used for Mill (or Router) - not Lathe.
All developers have turned it on in different ways.
Here is how each of us use it:
For PY, this is most likely already on. If CNC, this should be there in their newer posts. If you can't find this variable, its from an old post and we need to charge to add the Probing logic.