Help me to a SAP B1WS with Windows server 2012

Hi,

     I working with a SAP Business One in a client and i need install a soap server on a IIS 8 to deploy a web application to manage a invoices, clients, ...

     i download a "B1WS: Business One Web Services Wrapper" package and when a try to install i receibed an error:

     "ASP.NET registratioin failed. Value cannot be null. Parameter name: pathAs as consequence ASP.NET will not be registered in IIS, you will have to do this step manually. Please refer to B1WS documentation."

     When i can see a B1WS documentation.??

Thanks