Tutorial: Blueprint Spline locked sidescroller (e.g. Klonoa / Pandemonium style game)

Has anyone been able to get this to work with any recent versions of UE4? It appears that _C has been removed from the latest builds. I tried selecting Spline instead of Spline_C as a test. When I then try to select “Spline_Blueprint” in the character BP dropdown…it says “editing this value in a class default object is not allowed”. Any help would be very much appreciated as there are no longer any working tutorials around that show how to move an object on a spline path.