http://www.serip.com.pt/site/uploads/produtos/documentos/4F868AE0-439E0_3.pdf  The model different versions of the materials. The Readme.txt file is a small instruction on their use. The model uses free plugins ComplexFresnel https://www.sigershop.eu/free-3ds-max-plugins/sigertexmaps-complexfresnel/  and BerconMaps http://www.ylilammi.com/2013/09/berconmaps/  Turbosmooth in rendering mode . In the version of max2016 the stack is not minimized.