title: GWT, GWT Designer and Eclipse Plugin Issue
body: <p>I am learning GWT, so I am following this tutorial from Google GWT 
  <a href="https://developers.google.com/web-toolkit/tools/gwtdesigner/tutorials/stockwatcher" rel="nofollow noreferrer">https://developers.google.com/web-toolkit/tools/gwtdesigner/tutorials/stockwatcher</a></p>
  
  <p>In this I have to open a java file in design mode. 
  There I am getting the error</p>
  
  <p>java.lang.ClassNotFoundException: com.google.gwt.dev.shell.designtime.HostedModeSupportImpl</p>
  
  <p>I installed GWT designer via zip file, unzipping it and extracting it in the plugins and features folder.</p>
  
  <p>Is it correct way ? is that the reason why the java file is not opening in design mode?</p>
  
  <p>Also, I am not able to install a new software in eclipse, 
  See my question -></p>
  
  <p><a href="https://stackoverflow.com/questions/11232486/eclipse-3-7-indigo-install-new-software-not-progressing-gwt-designer">Eclipse 3.7 Indigo-&#39;Install new software&#39; not progressing : GWT Designer</a></p>