I managed to get the update today! I took my Wii U to my parents house and used their wi-fi. They are with a different internet provider, I'm with virginmedia and they are with BT. Anyway the update worked first time at their house. So if you can trying downloading it at a friend or relatives house.
I am having the exact same problem. I rang Nintendo and they said the servers are probably just overloaded, but it seems unlikely that it would do the exact same thing every time if it was solely down to the servers. Have you found a solution yet?
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