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Please see the original post here.
Changelog may be found here.
This update addresses some stability issues some folks have on OSX, and also provides better support for single-button mice on OSX.
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.