Texture Transformer is a program similar to the old Universal Texture Converter and Texture Converter 2 that were sold at DAZ 3D.  It's probably a poor man's version of the Blacksmith3D app except it's a one-time purchase and you add module packs for the different model conversions.  Unlike the older converter programs where the algorithm redraws the texture maps, this one requires a model with the texture already loaded.  You need to simplify the texture maps in the Material Room first; don't attempt to add fancy mathematical node arrangements or SSS, it will not recognize those connections and totally screw up the converted output.  And forget about converting into Cycles; its main focus is building the Material files around the PoserSurface node.  Do you want PBR?  Expect to go into the Material Room and get your hands dirty rebuilding the nodes.