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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:
Renishaw Probe for CQ
Set the O value for the first line.
1)

Change the probe_out_CQP0011 to yes$

Renishaw Probe for PY and CNC
Set the O value for the first line.

Uncomment the sx_support_mc$ line to turn it on
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.