Hi PILOU

>> Does this new one can works beside the old one ?
>> So i can launch the old or the new Plus as i want ?

I think you can load most of the old .nod files inside this version.
But, loading nodes created by this version inside old nodeeditor probably is not possible, Because I changed and moved so many nodes to new menus.
Also, there are some new nodes, widgets and data types in this version that older version doesn't support.