hey jsuarez388 !
I'm really sorry that it does not work for you,
i think it will not work with versions below 3.06 because "ADD" and "SUBSTRACT" nodes are used several times.
and yes like you can see with nodegraph pix above there is a total of 5 mix mat (I think lighten things in the future )
I work with r18 but i add already some returns that's working with r15 and r16
you can find more info ( french) there >> http://frenchcinema4d.fr/showthread.php?81447-Octane-Dirt-grunge-Helper-(WIP)
Anyway as I already said I will post a version a little improved, as soon as possible.
thanks for testing
ps/ its simply an xpresso controlling Octane Mixmat etc, and bring some parameters togetehr in UserData ... python scripts (sources are at the beginning of each) are used for the functional part (UI) and not at all for the management of the materials.