The SEP/SEPM are both licensed so Symantec has the ability to set a limit like a 60 day free trial. I don't believe the OVA is licensed at all so once you have it, you have can essentially use it forever. If you're not yet a customer this would be a problem for them.
With that said, it may just be as simple as calling support to find out what can be done. For instances like this, they may just give you a temp serial number so you can download it. They do this for other products so I don't see why this would be any different.
It's a 342MB file so it's too big to upload here.