when I import from Megascan directly I do not get Roughness and Spec maps to Vray. They are there if I download fbx file, and if I import that file and place all maps in slots al good, maps are there then for Vray.
Is there a setting option that I am missing with Megascan or Transmutr?
Roughness and Glossiness are not yet supported by Transmutr, this will come in a future release. For now, the Reflection map is also used in the Glossiness slot, which give good results in most cases.
Specular should be converted correctly to Reflection, though.
Can you make sure this map is downloaded in Quixel Bridge?