Please take a look at the security settings of your firewall (if you are using one) and make sure that Spybot-S&D is not blocked. That should help to get into the updates. If Spybot-S&D is not blocked it is also possible that our server is temporarily not available. Please try again a few hours later.

If this does not help please download the updates manually here.
Also, here is a direct download link. Just download and run that file - it is self-installing.