Curvy - Missing Playmaker Actions! HELP!

[toxicfrog]

Hello,

I bought Curvy specifically so I could animate an object along a spline using Playmaker.

I downloaded the Playmaker Custom Actions from http://docs.fluffyunderware.com/curvy/addons.html.

The Actions 'CurvyMoveAlongSpline' and 'CurvyMoveAlongSplineDistance' are both missing in the Action Browser.

I appear to have everything else, but these 2 (which I need more than any other) are not there. Please advise ASAP - I'm stuck until I fix this!

Thanks!

*edit:
Unity 5.5.1f1