For anyone else looking for it -
Once you get logged in to where you have My Dashboard - My Entitlements - My Downloads - etc. on the left, go to My Downloads and there will be a link for Free Software, then select VMware vSphere Hypervisor. You will need to check the "I Agree" box and, if you never entered your address previously, you'll have to do that now.
There doesn't seem to be any key though. Is this really perpetual software or will it stop working and/or go into super limited mode after a set amount of time?