title: Upgrade from Windows Phone 8.0 Development to Windows Phone 8.1 Development
body: <p>I am Developing Apps on "Microsoft Visual Studio Express 2012 For Windows Phone". I develop Windows Phone 8.0 Apps.</p>
  
  <p>Now I need to develop Windows Phone 8.1 Apps free. Which Visual Studio to use for this purpose.? and What about windows Phone 8.1 Emulator.</p>
  
  <p>If possible share both download links.</p>