I was having the same issue with Firefox and found that it seems to be a proxy issue on my corporate network. I switched over to our Guest network which has less restrictions and the download was successful. Not sure if you have that ability if its a laptop where you can run the update on a Guest network or at home? Otherwise I would have Network Security look at their firewall logs and see if its trying to go direct instead of through the proxy or if they need to tweak their proxy script.
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