This one has the usual variety of tweaks and fixes requested by players. Of particular note are some optional keybindings for turning on/off your highest/lowest efficiency reactors (micromanagers rejoice), and some options for multiplayer in terms of auto-building on allied planets.
Astro Trains also now actually shoot their guns again, after having been accidentally muzzled for the last six months, and ships with "temporary invincibility" now show up with an angry-looking red/yellow force field effect to make it more clear that they have that status effect.
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.