Need Help Installing inventor with Firstbase

Ive been trying to install Autodesk Inventor off the firstbase website. Everytime i use their Autodesk dowload tool i get an eror message saying that validation failed when i select to install Inventor. Ihave uninstalled and reinstalled off the site many times with no results. I saw someone post that u could download the 4 zip fiels but no one explained how to do so. If u could please respond with some help it would greatly appreciated

Note: Running WIndows XP 32-bit on a lenovo laptop