Created by: noahstier
Looks like he started using "release" in the link, instead of the most recent version number which changes over time.
edit- I noticed https://johnvansickle.com/ffmpeg/releases/ffmpeg-3.3.4-64bit-static.tar.xz would work too. https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-64bit-static.tar.xz would just be one fewer line to keep up to date