Autodesk has a Download Manager that is suppose to help when downloading large files. Most of the installation exe's are 2+ gig, so they are all large. The problem is that I talked with folks who have had problems with installing the Download Manager or they installed it and nothing happens. There is a link to the right that reads "Standard download method", but clicking that sometimes doesnt seem to do anything.
So, here is what I came across to to download the files without the Manager. In the past I have had to right click on the Download Manager when it says "Standard Download Method" and select Properties. Highlight the link information and paste into a new tab/browser page in Internet Explorer adn the nclick enter. This will open up the download dialog box to either save or run the application. This is not the best method, but one that has been successful for me. I hope it works for you as well!