We had an issue with the website yesterday that caused the issue you describe. If you remove your current version and get the latest from the website (version 1164 at the time of this post), it should fix the issue.
If it doesn’t… you could try flushing your DNS cache, might help. To do that on windows, go to start menu, type
run, then in the box type
cmd. At the command prompt that opens, run:
We had to move the location of the server that provides the downloads for auto-updating the client, and sometimes those DNS changes can take a little bit to work their way through the various caches on the internet. If the above doesn’t work, you could simply try again tomorrow, whatever dns server is preventing your machine from reaching our download server might have updated by then.