I do not have the said product but it is a python scripy which appears to create specific shader nodes to convey wounds and scars.  Unfortunately, if you apply first then VSS, VSS will overwrite the product nodes.  The other way around, the product may have problems detecting image map textures within VSS unusual node arrangements.  You will need to examine both node arrangements and figure out where to connect wounds/scars nodes within VSS.  It will also mean that the network will need to be reworked to intergrate the two.