A while back, I downloaded the WPCentral app on my Lumia 920. At the time, the app was free. I recently upgraded to the Lumia 1520, and now when I go to the store to download the app (using the same Microsoft account as I was using with the 920), the app shows as costing $0.99. I know at some point the app became a paid app, but should I have to pay the $0.99 if I had previously downloaded it when it was free?