I'm having the same problem, except I have a Mac so it doesn't say the same thing. I could go to the store's webpage, download items and still load them that way, but cannot connect via the launcher.
This started for me with the patch noted too. I don't know if I feel like downloading the latest patch, though, because it looks like it is just for Supernatural, which I don't have. Should I download it anyway and see if it will fix this problem?