This one is our first solely-polish release prior to the next official version, which will be coming out late this week and dubbed 1.1. Lots and lots of balance tweaks and bugfixes in here, and more to come later tonight.
This is a standard update that you can download through the
in-game updater itself, if you already have 0.500 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 0.500 or later, you can download that here.