I went to take advantage of this offer (without knowing my MSDN subscription had expired) and got this error message: “This offer is not available”.
This could mean that the offer truly isn’t available anymore, but what it means in this case is that my subscription has expired. It would be great if the message gave me more details, but go ahead and renew your subscription, wait for the renew to run through the system and try again.
Hopefully this saves you some time.
Here are the MSDN Subscriber benefits: