Crosspost from another thread, but a lot of people seem to struggle with the update.
A tip for everyone with update problems: please try the offline update. Instructions here. Don’t worry that the download link contains the version number “1.0.21”, it’s the correct file anyway.
The 1.0.21 is just telling the server that’s the version you’re currently running, setting it so far back ensures you’ll get the latest file in return.