This is geometry nodes modifier setup, not an addon.

Easiest way to use it in your projects is to copy one of the Tornado objects (CTRL+C) and paste (CTRL+V) it into your project. Then customize it to your needs.

Cycles

In cycles you may have black artefacts like this:

To fix it increase Transparent light bounce count under Light Paths tab:

(The higher the layer count in your tornado, the higher this parameter needs to be.)