To enable SetD support, you will have to use the plate.k file. In the LS-PrePost, go to SetD, then check Create > Plate Nodes > ByPart. After this procedure, go to graphics window to see the part. This is the official way for the LS-PrePost application.
For more information, use the documentation from the official website: http://www.lstc.com/lspp/content/tutorials/pre/p5_setd1/p5_setd1.shtml