2014 is only 64bit.
2013 and earlier are both 32bit and 64bit. If you are just looking for a product download you should be able to find it at the Autodesk Customer Service Virtual Agent:
1. Go to http://www.autodesk.com
2. Click on Contact Us at the bottom of the page
3. Click on Customer Service
4. Click on Virtual Agent “Ask”
5. Once the Virtual Agent window opens: Select the choice "Download Links".
6. Select your product, then variant, then version as applicable.
7. You should now be presented with the choice to download your software.