title: Windows 7 installer package error 2869 while installing an upgraded version
body: <p>I have an application with version no: 1.0.0.1, which is an upgrade to the older version 1.0.0.0. </p>
  
  <blockquote>
    <p>When I try to install the new version
    1.0.0.1, when my system already has the older version installed, I am
    getting the error 2869.</p>
  </blockquote>
  
  <p>But if I uninstall the older version manually &amp; than try to install the newer version, then it installs successfully. </p>
  
  <p>I changed the product code for new version. But did not change the upgrade code. </p>
  
  <p>Can anyone kindly let me know the reason and fix for this?</p>