Then I clicked the drop down menu again and selected browser download, which gave me a file that was I think 3 GB- so after downloading that, still nothing happened. Then I clicked the drop down menu and hit 'Dowload Now' and after doing that, nothing happened, except for installing the Autodesk Dowload Manager.
After that, it gave me a serial number and product key, so I proceeded by clicking 'Install Now'. When it installed, it said there was an error because it couldnt find the destination or something. Then, I signed in and filled out the version, language, and operating system I had, on this website.
Initially, I was going to just get the 30 day free-trial, but realized that students can get it for 3 years with a free license. I downloaded and installed Autodesk Inventor Professional 2015, free, with a free 3- year license because I am a student.