use a different (wired) internet connection and/or a download manager. you can also try dl'g from prodsigntools.com
to dl from prodesign.com, go here: http://prodesigntools.com/all-adobe-cs5-direct-download-links.html
if you have a problem starting the download, you didn't follow all 7 steps, or your browser does not accept cookies.
the most common problem is caused by failing to meticulously follow steps 1,2 and/or 3 (which adds a cookie to your system enabling you to download the correct version from adobe.com).
failure to obtain that cookie results in an error page being displayed after clicking a link on prodesigntools.com or initiates the download of an incorrect (eg, current) version.