@UnknownUser (View Post)
This mod is old and unsupported, and no longer has active download links. You should look for a new mod.

That said ... I do have a collection of more recent mods
https://starcatcher.us/TPT/legacy/FeynmanPowder.zip
https://starcatcher.us/TPT/legacy/FeynmanPowder-linux.zip

I can't guarantee these are the latest versions (Linux is a little more recent). I don't have the source code for this mod, unfortunately.