Greetings,
I was following the cascade tutorial to create sparks. The Particle Size By Speed is not in the list when I looked into the options available . Also The RadialGradientExponential did not work for me . I was able to fix the RadialGradientExponential node to get the transparent smokey look. But now I am not finding the Size by Spped node. I am using 4.2.1

Thanks in advance.