This one is a small bugfixing update to deal with some critical issues that came to my attention just this morning. Between working on The Last Federation (and, before that, Bionic Dues) and a third daughter coming along in September there hasn't been room in my schedule for AI War coding.
That said, I fully intended to fix any major problems that came up (the latest versions being beta releases after all), and I figured such stuff would bubble up to me without my needing to personally take time from new project coding to check mantis on a different project and such.
I was wrong (and should have verified my assumptions earlier), and there's been a few unhandled-errors/save-corruption reports sitting out there since at least late September. Very sorry about that, I will be more vigilant in the future.
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.