Select your model file. The plugin will read the VVD data automatically.
To convert a (a Valve Vertex Data file used in the Source Engine) to the OBJ format, you must first decompile the primary model files that use the VVD data. The VVD file itself only contains vertex data and cannot be converted in isolation; it must be processed along with its associated .mdl and .vtx files. Conversion Process vvd to obj new