fix broken ref

content/index.txt

@@ -35,7 +35,7 @@ The following examples are meant to give an overview of what is possible with
 Kwant.  The tutorial section of `Kwant documentation <doc/1.0/>`_ and the
 `Kwant paper`_ each contain several pedagogical examples with line-by-line
 explanations (`zipfile of all examples
-<http://downloads.kwant-project.org/examples/kwant-examples.zip>`_).
+<http://downloads.kwant-project.org/examples/kwant-examples-1.0.0.zip>`_).
 
 
 Graphene flake