Yeah, as a general rule, when I mess with any of the deep systems of the game, things often get worse before they get better. The build that's up on "in_development" as of today mostly contains minor bug fixes and optimizations, so it's probably not too dangerous. But, we're working on some fairly sweeping updates to AI behaviors and terraforming mechanics, and when that stuff starts going in, the game will probably do quirky things for a while, until we (and the bleeding edge testers) have worked out most of the bugs.

The "stable" builds are what we expect most people to play on.

I believe if you go to https://www.gog.com/account, you should see an option to "view downloads" for Stars in Shadow. Then you can click "download offline backup game installers".

These installers usually get updated a few days after we post a patch to Galaxy/Steam. Sometimes there will be a "Patch" file that you can download that will upgrade your current build to the latest build. But, sometimes you just need to download all the game files again from scratch.

That said, I'm looking at the offline installers now, and it looks like they haven't been updated to include the latest patches. I'll ask my contacts at GoG.com about that...

Edit: I talked to the GoG people, and they fixed it. The offline installers should now be up to date.