title: How to set automaticly DefaultDirName for previous Inno Setup installation?
body: <p>my previous installation (A) in Inno Setup has AppID={{8ADA0E54-F327-4717-85A9-9DE3F8A6D100}. </p>
  
  <p>I have another installation (B) with different AppID and I want to install it into the same directory as installation (A). </p>
  
  <p>How do I get automaticly DefaultDirName? I don't want to use the same AppID, because when I uninstall the installation (B) and installation (A) stays installed, it will delete AppID string from registry (installation (A) string). </p>
  
  <p>Can you help me, please?</p>