Frenchy Pilou
>>Does all that (+ nodeditor) works also for the V3 or it's only for the beta V 4 ?
Yes. The current version of nodeeditor are fully compatible with all v3/v4 win/mac MoI versions.

Finema
>>where we put interface.js and index.htm file ?
nodeeditor/nodes/interface.js
nodeeditor/index.htm