The game Divinity: Original Sin - Enhanced Edition received an update to PTBR two weeks ago, in the GOG Galaxy launcher it is translated, but in the offline download version the translation has not yet arrived.

I see, I stand corrected then. Thanks.

A bit weird, that - considering they still store older versions for the benefit of Galaxy.

As an incentive to get people to use it, maybe...

Or as an incentive for those of us not using galaxy to leave already and stop being a nuisance...

Yeah!, that too... I guess if force was applied, and there was no stopping the Galaxy freight train for access to our games purchases, (for me) Itch.io (which I already have an account and small sum of games with) would (sadly) have to be my next best alternative. But hopefully things won't be allow to progress to that point...

Yellow alert (since it could be just an oversight on the developer's and/or GoG's side) for Darwinia, which seems to have been missing the offline installer versions of its new builds (only available through Galaxy?) since June?

Also, in an ironic twist, the latest version of Darwinia on GoG actually seems to be newer (by several months) than the one available on the other platform.

As far as I can see, all the (many) updates since June are marked as beta versions in galaxy. GOG has stated before that it does not create offline installers for beta versions, only for release versions (so it's not an oversight). I believe it is the developer who decides whether to mark a version as beta or not. Whether it is intentional in this case, or not, I cannot say --- but the large number of updates does seem to be in line with it being in-development beta versions.

That would explain it, thanks for checking/looking into it.

Mount and Blade 2 has no achievements on gog. They are added to steam.

Another developer who treats us like second class users.

There's a separate thread specifically for recording achievement issues:
https://www.gog.com/forum/general/list_of_broken_gog_achievements
You might want to report this there.

Ne no Kami: The Two Princess Knights of Kyoto
DLC "Extra Story" is free on the publisher's own site, but not here.
Missing "Artbook" DLC, which is available on the publisher's site.
Missing the +18 patch which is available on the publisher's site.

Ne no Kami: The Two Princess Knights of Kyoto Part 2
Missing the +18 patch which is available on the publisher's site.

On Denpasoft's defense about the +18 patches, they were released even before Steam started allowing uncensored eroges, so it may have flown under their radar.

Ask the devs, they probably will add it. Archivements are not part of the second class thread.

XIII - Remake
Missing the 2022-09-13 update (based upon gogdb.org), done by a different developer.

From Steam: Based upon a quick read of a few reviews it seems to be a huge improvement over the 2020 release, scoring 7-7.5 out of 10. Most importantly it seems to be bug free.

AFAIK we have this update.