MSDN Library Setup asks for VS .NET 2003 Enterprise Developer DVD

Because my school is member of the MSDNAA-Program, I got an account and
access to download Microsoft Software for study. So I downloaded the
following products:

* Visual Studio .NET 2003 Professional - Full Install (German)
* MSDN Library for Visual Studio .NET 2003 Full (German)

When I try to install the MSDN Library, it always asks me to insert the
Visual Studio .NET 2003 Enterprise Developer DVD (German). But of course I
don't own this.

I also tried to preinstall an older version of MSDN Library (2001 I guess)
and update this with the MSDN Library for Visual Studio .NET 2003 Full
(German) DVD, but unfortunately with the same result like before.

Does anyone have an issue what's the reason why MSDN Library Setup asks for
the Visual Studio .NET 2003 Enterprise Developer DVD ?  It doesn't accept my
Visual Studio .NET 2003 Professional DVD.

Thank you very much for your help.

Best Regards

Achim Hofmann