He thought it wasn't as important since it was a rare issue. He surely meant no harm and without him I would not even know when the bug occurs (which hopefully might help to fix it).

I just did. He noticed the bug the first time about a year ago in Chernobylite:

Download changed: Installer, Chernobylite, Windows, en
Version 31663hotfixV3 ⇒ 31663hotfixV2_1, Size 32.4 GB ⇒ 32.4 GB 2020-09-24

gogdb.org/product/1472128402#changelog

Of course neither he nor I can tell you how often this really happened.

Thanks, at least that gives us an idea. As far as that goes, even happening once is once too often. Hopefully this can be rectified in short order depending on how many installers went without updates due to this bug.

So it happens only occasionally (rarely), not all the time? Do you know how to reproduce the problem?

Hopefully GOG is able to catch why it happened with that particular game, or reproduce the problem. Rarely occurring problems are the worst. Just last week at work I was troubleshooting a problem with one of our suppliers as their product showed a problem that I don't recall seeing elsewhere. They really much wanted to know how to reproduce the problem, but I had no idea, I just new it had happened at least once in one part of the system.

In the end we had to close the ticket as not reproducible, and with a workaround so that I wasn't blocked by that incident. "The guy" being a game developer/publisher, not GOG staff?

Maybe they were busy that they couldn't or didn't want to use any time to troubleshoot it with a "secondary" store like GOG... Happens to the best of us, I also had to find a timeslot in my timetable to report a problem to our supplier, and later troubleshoot it with their staff on a Zoom conference...

As I explained in the OP it only happens when the game receives multiple updates before the first offline installer has been created - that's also the way to reproduce it.

Agreed, if there's no logic behind the bug so that it's rather impossible to reproduce it, it's almost impossible to fix it. Luckily there's a reproduceable logic in the bug here.

Not even a game developer - just another user that noticed this bug and figured out when it happens.

Not once since 2009 have I ever had a ticket/email ignored by them... if you get no response I'll place one as well. I also own Succubus and download updates via API calls so If my older offline got ditched then I'll have record.

Let me know by message or replying here ✌️

My tickets also weren't ignored but sometimes the time it took until GOG even replied was basically inacceptable (you can't blame everything on the pandemic if you ask me) - also the times GOG support actually could help me whenever the reason for a ticket was a technical issue with the game was basically zero - even though I knew how to fix the bug and told them how to do. That's the reason why I was a bit hesitant with creating another ticket.

Thank you for the offer with Succubus but apparently the offline installer is back. That's one part of the problem fixed - though it is only a small part.

If GOG actually read this thread it would have been nice if they'd replied here telling us about the state of the ptoblem and if it is fixed or will be fixed. Unfortunately fixing things without even mentioning anything or offering any kind of apologies seems to be the new GOG "communication". So let's just hope they did read this thread and really fixed the issue. Maybe they even were able to figure out which games in the past were affected as well and will get those offline installers back as well ... okay - now I am dreaming. Just let's keep up our hope that GOG at core still wants to do things right :)

I've PMed SmollestLight about this to see if they can forward it up the chain and maybe expedite the ticket. I know they don't encourage that ,but hey, this is kind of a community problem, not a personal ticket.

Server error when trying to download Succubus offline installer via Galaxy (the download method GOG prefers since the GOG Downloader is obsolete - as I can see) ... it is no fun anymore.

Edit: Downloading via browser is still working - so the problem here is the great Galaxy ... once again. I am so happy that GOG invented this unfinished piece of whatever this is...

I also PM chandra, seems to be an isolated bug, there are no many reports about it and fix very quickly with a new update.

There might not be many reports about the bug itself but there are quite a few reports about missing offline installers and we don't know how many missing offline installers are just missing because of the issue. To find this out one would have to track back the updates for every game and see in which cases the newer update has been overwritten with an older one. I did not know about this bug as well but we have proof that it happened at the very least two times and we simply don't know how often it has happened for real. So calling it an isolated issue might be a bit of an understatement.

Don't know how well you like CLI interfaces but GOGREPO is a python fuled game update, very fine grain in what you want to do and download. Its how i keep a single offline archive of all my games from GOG.

https://github.com/Kalanyr/gogrepoc

And here is the official Forum thread with the developer of the fork i linked above.

https://www.gog.com/forum/general/gogrepopy_python_script_for_regularly_backing_up_your_purchased_gog_collection_for_full_offline_e

Thank you - I know about gogrepo and tried it out once but was not very happy. I am more of a point and click guy when it comes to interfaces. :)

The most recent version of Succubus is back up. as in you can download it again.
I mean 1.3.15142.