Was there a Radial Wipe node? Deprecated or renamed?
Trying to follow this tutorial https://www.youtube.com/watch?v=V70QXh7zKB0&feature=youtu.be
There is a link in the description about downloading something. That might be it…
It is part of the natron community plugins: natron-plugins/Merge/Radial Wipe at master · NatronGitHub/natron-plugins · GitHub
See instructions to install the community plugins: