Most "other sources" will have split the file into rars and created parity recovery files for it which is a far far far better way of dealing with such a big download.
This is a warning quote on the easynews web page about single files in excess of 255 meg
Quote:
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Originally Posted by Easynews
Never download any zip file or zip segment that is greater than 255 Megabytes (MB) in size. If your zip file is greater than 255 MB, use a download manager to split the download into multiple parts.
This is a limitation of broken, or misconfigured, web cache servers operated by your ISP. These cache servers behave in unexpected ways when transferring files greater than 255 MB in size. They can induce corruption, or premature session termination.
The cache servers are usually transparent. You can't tell they are in place until they corrupt a download.
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This is a similar explaination as posted earlier about bigger files and NTL's proxies just not able to deal with it

Micr$oft should archive there iso's before hosting imo