Which character exactly have you purchased ? You may need Morphs++ for V4 to be installed .The Inj file may dial some of these morphs++ , so if you don't have this package of extra morphs , the inj file will dial ...nothing at all .
There are several characters for V4 that are "custom" morphed , that means that you don't need these morphs++ .

Materials files will work anyway - you may put a material on any ( morphed or not ) V4.

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