title: Install the same program twice with InstallShield?
body: <p>Is there a <code>NoUninstall=Y</code> or similar option I can put into Setup.ini for a program?</p>
  
  <p>I want to compare the behaviour of a patched and non-patched version of some software. To do that, I need 2 copies installed in different folders.</p>
  
  <p>When I run setup.exe the second time, I am prompted to uninstall.</p>
  
  <p>If I change <code>DoMaintenance=N</code> -> <code>DoMaintenance=Y</code>, I get the option to Modify, Repair, Uninstall.</p>
  
  <p>I do not have access to the original InstallShield project files.</p>
  
  <p>I'd like to avoid having to use Virtual PC.</p>
  
  <p>Otherwise can I change the GUID of the first install within Windows/Regedit?</p>