Unsure what exactly you have with Autodesk, but Brian described how you can download it from the subscription area in the following link: http://crackingthevault.typepad.com/crackingthevau
If you have one of the "pay for" products it should be on a second disk in your media package.
Start with some of our most frequented solutions to get help installing your software.
Upgrading to a 2015 product? Make sure to check these out 1st!