Whenever I go to update Spybot S&D 2.0 RC3, I click the "Update" button and get a dialog box with the following error message: "No network connection available! Please check your connection settings." I set my McAfee SecurityCenter's firewall to allow all Spybot-related files and services full access to the Internet. So what's going on here?

I am running Windows 7 64-bit SP1 with all the latest updates and Internet Explorer 9 and Firefox 16.