title: Qt Installer, overwrite previous version
body: <p>I am using the latest Qt Installer version 2.0.3
  I have created an installer for my app, but when I try to install it I get the following error message: "The folder you selected already exists and contains an installation. Chose different target for installation"</p>
  
  <p>How can I indicate Qt Installer to overwrite the old version? is this officially supported?</p>