Most of the games I get from GoG are old. So the off-line installers are normally up-to-date with the last version. With other games that I got at the time they were released (Mostly from Obsidian and Inxile), we were always able to get their patches with a delay relatively tolerable (2 - 5 days) in relation to Steam. Even when GoG Downloader was put on deprecated mode getting the patches and the games didn't change that much.
But now, with Wasteland 3 my experience is totally different. In the first place, the special DLC seems to do not load properly on
offline installed games. You need GOG Galaxy yes or yes. And the last patch, as far as I understand, seems
to be already available with GOG Galaxy but is still not available for direct download.
Is this the new way ? Gog Galaxy is OK. But a magical interface to all my game stores (with their DRMs if they are not from GoG) and the games achievements is truly irrelevant for me. The experience that GoG was given to its clients originally is what got my interest on them.
P.s. Of course, this could be a problem from Inxile, but after at least 4 games released on GOG on the last 5 years. I'm very sure they know how to tackle the patches for this platform.
EDIT: I lost Internet entirely two days before Wasteland 3 release, and until now I recovered it. So, I was depending on the offline installers.