[contingencies]

A download manager would be fine if there was a non-opaque method of determining the download address, and they actually let you do that (I know the developer site for instance uses some combination of cookies/referrers to limit external access to binaries presented for download).

[sitkack]

I haven't tested this specifically, but I did something similar

https://gist.github.com/dbr/294151

extracting cookies out of Safari so I could download developer binaries from apple.