title: Unable to install or run the application - System.Windows.Interactivity Version 4.0.0.0
body: <p>I am absolutely stuck.Searched and searched.
  I have a reference to System.Windows.Interactivity Version 4.5.0.0
  When I release the system via ClickOnce the system does not installed and reports the following error.</p>
  
  <blockquote>
    <p>Unable to install or run the application. The application requires
    that assembly System.Windows.Interactivity Version 4.0.0.0 be
    installed in the global assembly cache (GAC) first.</p>
  </blockquote>
  
  <p>I am using DevExpress tools along with MVVMLight. If I try and add version 4.0.0.0 I get errors as 4.5 is required. Any help would be gratefully accepted. Thanks Scott</p>