When you try to re-install an app that you had previously deleted from your windows phone, you might get the error there are no refunds for this purchase. 

To resolve this, follow these steps.

  1. Go to http://www.windowsphone.com, sign in,
  2. Click on "My Phone" and then on "Account".
  3. You should be able to find reinstall button for the app you want to reinstall