Disable and Remove Pope Blockers, Cookies, Browser Cache.
Disable Security (Temporarily) Virus Scan, Firewall, Port Blocking, VPN.
This can cause issues because the speed can very using WiFi.
Use a wired connection rather than a WiFi.
If you have issues with the methods above you could try using AVA which is the Autodesk Virtual Agent.
Browser Download (Slower this is just downloading Multiple files that are Autodesks version of spanned zip files, This can have issues with Pop-up Blockers etc., because you may not be getting all of the files you need look for the count on the download file name such as 1of2 and you only have 1 file etc.).
Download Now (Downloads the entire installer however it does use a Download Manager which can have issues with Security).
Install Now (Performs an online install and can have security and speed issues).