We could successfully open your file without error as shown in the attached image. Please open the diagram by double-clicking the diagram in Explorer.
StarUML is not a diagram editor, but a modeling tool which can make multiple diagrams in a model file. So, you need to open a diagram in order to see the diagram.
StarUML 2 documentation is available in
http://docs.staruml.io. even the doc is not complete yet, it could be helpful to understand how to use.
Thank you for using StarUML.

2014년 10월 17일 금요일 오후 3시 44분 16초 UTC+9, long gong 님의 말: