Hezer Hajrullaaga shows how you can animate a projected spline in C4D without using plugins.
There are several ways to use splines in Cinema 4D. One popular workflow technique is to project the spline on to other objects. When you create a spline projection, the ability to place animation on top of the spline may get limited. Check out this new tutorial from Hezer Hajrullaaga who shows a simple method to animate a projected spline. Hezer also explains how you can do it without any special plugins.
Check out these other spline projection tutorials too.
One time, Samuel Winter shows more than one way that you can create a spline projection in Cinema 4D.
Lars Scholten shares a look into the various methods you can use to project geometry onto a surface in Cinema 4D.
and Joren Kandel shows a method for projecting splines on curved surfaces in Cinema 4D with minimal distortion.