The downloads are going to be big. These are engineering tools upwards of 450MB. I've already spoken to them about other options (torrent files, repackaging as a web installer, splitting them up or pairing them down, compression, etc.) but this, download manager, is the route they want to go in. To be honest, I loathe download managers and bypass them altogether whenever possible. However, the upside to a download manager is that the clients end users can pause and resume the download as necessary, and since they have users downloading from around the world and only one server farm in the US I can see it being useful to have the option as an end user. (I've also suggested having them host the files in Amazon or Google's cloud space, but they don't want to do that either.)
Which brings us back to a download manager. Of course, if anyone has a solution that I haven't thought of already I'd love to hear it.