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Please see the original post here.
Changelog may be found here.
This release has a small number of bugfixes and tweaks that came up post-4.0, and we wanted to go ahead and get this into your hands as soon as possible just to make sure things remain clean. Enjoy!
This is a standard update that you can download through the in-game updater itself, if you already have 4.000 or later. When you launch the game, you'll see the notice of the update having been found if you're connected to the Internet at the time. If you don't have 4.000 or later, you can download that here.