I got that installer very quickly using a BitTorrent client, when it was new and lots of seeders were available; don't know about today, as many people already have it, and may not share it any longer...
The computer speed is irrelevant for downloading, it only depends on (1) the uploading speed of the chosen server, and (2) your downloading speed limit set by your internet provider. BitTorrent downloads from several (possibly several dozen up to hundred) people sharing the file, so it is often faster than the HTTP download from only one server. With a 3 Mbps connection, I got it in half an hour.
Furthermore: DO NOT UPDATE! -- Unfortunately, the installer still has this option checked by default, although the developers should know that the update servers are not reliably up-to-date.