If devs do it right they simply use the Galaxy API to upload updates - more or less the same way as they do on Steam (offline installers will be handled afterwards by GOG). Some devs simply don't know about this API and still upload their files the usual way to GOG. Of course that's also in part GOGs fault since they don't seem to do many efforts to tell the devs how to make their life more easy. Then again, the devs could also ASK GOG how to do make things more easy ... in the end it is always the same. Some devs WANT to get their games updated on GOG asap and some don't really care that much.

As Marko said, GOG streamlined the upload process a while back that allows devs to upload patches like Steam, but even after all this time it seems not all devs are aware of it and continue to do things the hard way.

This problem hit with a number of titles where the uploaded title is broken reporting incorrect sizes etc I'm pretty sure its a issue with GOG uploading to their CDN as in the case of Bards Tale 4 linux when they finally got a working version uploaded folks were able to use the broken download as a starting point and complete the download without having to download everything from scratch. So basically GOG have made a working installer but fail to upload it properly, apparently they don't do any verification. Linux installers are at greater risk as they a single file rather than broken into chunks so more opportunity for something to go wrong during the upload. The installers that this has happened to for me have all been bigger than 20gb.

Are not the same patches that we find in our library. These are digitally signed by GOG, and I doubt that GOG gives their key to other companies. Most likely, the devs send only what files have changed since the previous version, probably archived or something. And, supposedly, GOG tests themselves every game before releasing the offline installers and the patches.

The new method of submitting the updates through Galaxy, is another story which the folks above me already explained it.

Sorry for the late reply...

I do not understand what you mean by "sync the offline installer to the galaxy client". What I can tell you right now is that I installed the game through Galaxy, and removed quicktime.qts and ddraw.dll from the game folder, plus the intro videos.

He didn't make a claim....note the question mark in the title.

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It might not be dying, but the slim profit margins it had a few quarters and needing CDPR money to balance the budget aren't good signs.

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They must still test said updates on all OSs the store supports officially, which takes a bit of time I would assume.

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Why remove any files? To cut bloat? To fix issues? Try leaving those files(maybe it's the intros) in and see if it works then.

Why? Because then the game would not run at all. Those are recommended steps to play it under Windows 8 & 10, which Gog does not officially support for that titile.

There could be other fixes that fix such or don't involve needing to remove as many files...did you check for other possible fixes beyond just those?

Yes, I did.

So their claims of testing is for show according to you, then? :|

Name 5 more, then 5 more, then take all those and stack them next to all the installers that DID work with no issues.

Yes, whatever testing they do (if any) is very sloppy, and they might not bother checking even if you report a bug that affects everyone playing a given game. Also the claim that they're fixing problems in old games to ensure they work properly on modern systems is BS. Maybe they did it in the past, but recently no. Abandoned values are what I know GOG for.

*Citation needed*

They have pills for that sort of pessimism. ;)