SAP.Net.Setup_2.0.msi throws “You must first install the Visual Studio.NET 7.1”
How to deal with SAP .NET Connector installation issues
During installation of the SAP .NET Connector the setup throws this error because no Visual Studio 2003 could be found.
If you only need the assembly sap.connector.dll (for instance in cases of old projects which references this dll) you could ask google for downloading it ;-)