How to work with DESLib in Wolfram SystemModeler 4.1 - wolfram-mathematica

As a newbie in System Modeler 4.1 I am interested in queuing systems and found the DESLib, especially the ArenaLib. Unfortunately DESLib 1.7 seems not to work within this environment (version problem?).
Does anyone know how to download, install and test DESLib?
regards
Volker

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