title: unable to install xamarin from vs 2015 setup
body: <p>I have vs 2015 upgrade 1 installed and I try to install Xamrin from the setup, but when I try to install it, at the end receive this error message:</p>
  
  <p>C#/.Net Xamarin
  The installer has encountered an unexpected error installing this package. This may indicate a problem with package. The error code is 2711.</p>
  
  <p>how can I solve this?</p>