I'm also interested in any information on this. I'm wondering for a while now why the GOG version stopped being updated.
can give some positive answers regarding this issue
Sorry I missed these posts here, I did respond to this question elsewhere in our community but I thought I should respond here for the benefit of anyone else interested.
Whenever we release a patch we upload any builds for GOG the same day, this usually means that Galaxy will be updated immediately (as we are able to deploy builds to Galaxy directly). However offline installers for GOG are typically maintained by the GOG team themselves, naturally, this includes the Linux version.
While we upload these builds to them they have to put together the actual installer and make it available for you. This can usually take anywhere between a few hours and a few days. If an update is released and the offline installers are not yet updated after a day or two you can contact us (Discord, Twitter, Forums) and we can follow up with them.
In some lighter news GOG has recently deployed a more unified method of handling offline installer builds for the Linux version (which was previously handled entirely differently from Windows and OS X) and hopefully if you're on Linux this should help ensure you receive this build at the same time as the oithers when it comes to offline installers.
Hope that helps to shed some light on the situation.
Thanks for the clarification Lee. I do use the offline installer (windows). Sorry I blamed you guys, while it's in fact GOG who's behind. If GOG launcher 2 is good. I'll start using that (although I always will keep downloading offline files for my personal backup)