title: unable to install jet plugin on eclipse JUNO
body: <p>hello guys i tried to download Jet as an EMF Component but it doesn't work , so i tried to download  an  <a href="http://www.eclipse.org/downloads/download.php?file=/modeling/m2t/jet/downloads/drops/1.1.0/R201006081558/m2t-jet-Update-1.1.0.zip" rel="nofollow">archived update</a></p>
  
  <p>i get the following error : </p>
  
  <blockquote>
    <p>An error occurred while collecting items to be installed
    session context was:(profile=epp.package.modeling, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
    Problems downloading artifact: osgi.bundle,org.eclipse.jet,1.1.1.v201101311015.
    MD5 hash is not as expected. Expected: 5bb513bb6cc5dcc936ddb22aebcd0af4 and found 9e831f7e6d7532b3afd6bc76c48885de.</p>
  </blockquote>