I was having problems with Adobe premier CS3 downloading it's updates a couple of day ago but it seems to have managed to complete the download overnight now.
Try at different times of day and you might do better, if not install a download manager, then if it does fail you can resume the download from where it failed
Something like this
http://www.download.com/Download-Accelerator-P lus/3000-2071_4-10037157.html?tag=mncol&cdlPid =10885215
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