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Oracle's download servers can be a bit flaky (although I've never had a problem downloading multigigbyte database code - it always seems to be sql developer), and it seems once you get a broken download you keep getting a broken download. Perhaps it is cached somewhere on the edge of oracle's network.
Try downloading from a different location (e.g home instead of office) as it is likely any office connection will go through the same route and caches.
FYI: answer here was that our networks team had added a virus checker to large files that hung the download.