Need a spline plugin to sketchup Make 2017

Can somebody tell/Explane to me how this is done. I m not new to sketchUP, but I don’t use it every day for this type of project that I want to do

https://sketchucation.com/pluginstore?pln=BezierSpline
or newer…
https://sketchucation.com/pluginstore?pln=FredoSpline
which needs installation of…
https://sketchucation.com/pluginstore?pln=LibFredo6

Download the RBZs and use the Extension Manager to install them…

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Thank you very much for your help