Hi Martial, the Brushes from Ringo works fine under the paint feature BUT you will need to correct a reference in the installation, for this you will need to look at this thread that I created at Daz3D site:

http://forum.daz3d.com/viewtopic.php?p=1604406#1604406

After that you could paint freelly. You need to add a object (or character) click in the new Brush and Plane icon and add a color channel to the object... now you can use the brush.

I will do a simple tutorial about using the paint feature soon.

Follow me at euQfiz Digital