fixed issue #814, link to releases:

applications/examples/views/default/download.html

@@ -29,7 +29,7 @@
     </tr>
     <tr>
       <td><a class="btn btn-180 btn-success" href="https://dl.dropbox.com/u/18065445/web2py/web2py_manual_5th.pdf">Manual</a></td>
-      <td><a class="btn btn-180" href="{{=URL('changelog')}}">Change Log</a></td>
+      <td><a class="btn btn-180" href="https://github.com/web2py/web2py/releases">Change Log</a></td>
       <td><a class="btn btn-180" href="https://github.com/web2py/web2py/issues">Report a Bug</a></td>
     </tr>
   </table>