title: How to find & uninstall the patch [msp] installed in a machine?
body: <p>I have created patch [msp] using installsheild.</p>
  
  <p>At that time i was not aware of that option </p>
  
  <blockquote>
    <p>"Allow Patch to be uninstalled "</p>
  </blockquote>
  
  <p>Now that patch has to be uninstalled. </p>
  
  <p>I am having that msp file with me.[I open the msp using orca and check for product GUID but it was not there]</p>
  
  <p>Which information can be used to find &amp; uninstall the msp already installed in a machine?</p>