Dillman,
It could be a number of things but the first thing I would do is increase the timeout. Remember that WWW::Mechanize is a subclass of LWP::Useragent. I believe the default is 180. 
$agent->timeout(300);

[download]
There is also a max_size but the default is undefined and I don't believe WWW::Mechanize doesn't change it.

Cheers - L~R

In reply to Re: Downloading large file fails using Mechanize get function by Limbic~Region
in thread Downloading large file fails using Mechanize get function by Dillman

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