Error code 0x803f7003 is about intermittent network connection error.
This is most likely due to the heavy load the servers at Microsoft are under. This is the biggest day on the Internet and Windows 10 is causing a record high of Internet Traffic... yeah, most data being transferred in the history of the Internet. Expect this probably for the next few days.
Since the problem is "intermittent", it is possible, like when dialing a land line that has a busy signal, that you may be able to download it between loads. Just keep trying for a bit. If that doesn't work, wait a day or so and try again.