The problem with the changelog would be, that this one is not supplied by GoG but by the Devs.

For versionating installers, just write the upload date behind them and sort them by date.
It would be good too, if they could seperate patches and installers.
But it might be, that old installers are just stored at a filegrave server (because you can get them from support) to not overload the usual servers and the database.

And there is the other problem about those games with 32 and 64 bit installers.
Usually GoG just numbers everything from 1 to X and sometimes forgets to write into the name what is the 32 and what the 64 installer.
While I'm not that sure if those installers are not supplied by the Devs in some way too.

I was talking about GOG itself deleting the older installers, not GOGrepo. If you had managed to keep a backup of the old installer too (which seems to go against your first sentence), then no problem. If not, or you deleted the backup, too bad! You have to sit and wait and hope that MAYBE it will get fixed. Do you see offline installers getting fixed as a big priority around here? Because I can point you to the "Games that might not run without Galaxy" topic on this forum discussing games that are months and months out of date compared to the working Galaxy version. Lest anyone think this is only on a small game or two and somehow just due to some poor, overworked, one-person indie developer doing the best they can, I'd point out that a massive hit like Divinity Original Sin is one of the games apparently well out of date for us second-class offline installer users, with what many describe as a game-breaking bug.

Oh and by the way, even if you download a new version and it works for the time being, you may want to keep your older versions in case an OS update breaks compatibility with the newest version later on in time.

I had already pointed out that the changelogs in most games are lackluster to say the least, so I'm all for a more efficient and automated system and for the possibility to download older versions of the games.

If you are talking about the "missing skillbook tooltip bug", that was not about the offline installer being out of date compared to the Galaxy version. It was about the NEWEST version of the game having such a bug. And that sparked this discussion that offline installer users would also need to have access to the OLDER versions of the game where that bug didn't exist yet.

Also, interestingly, quite many people didn't even see that bug in the latest version of the game. Either way, the developer of the game should fix it, if there is such a problem. And I stress: the bug is there also for Galaxy users in the latest version of the game.

98.6% of the time, it is the other way around: the newer version of the game is more likely to work with new (and future) OS updates, or graphics driver updates, or whatever.

Ah, you are right, my brain got that a bit scrambled but my point about it being important for GOG to keep old versions stands. I recently saw with For the King where the new version seems to only work in Galaxy whereas it is stuck before the start-up screen for offline installer users, which wasn't the case in the past. So let's use the example of For the King instead.

So, had feedback on the ticket. The information has been passed to the dev team, but it was the generic, use galaxy and the rollback feature which I have gone back and questioned. If galaxy can rollback than previous versions must be available, hence just need to be made available to the website.

With current world issues, I don’t see this moving on anytime soon though. Might have to look for another way to get a list of updates (it’s now been 3-4 weeks, no update flags on any game), so that seems fully gone now. Perhaps gogrepo can be set to check for updates after a certain date? Never used it myself. Also, no way to go back to a working version for those that have the most recent one I am afraid.

Galaxy half worked.
Your suggestion would save bandwidth instead of people downloading the whole game again when there was a new version.

Bumping this and adding some further information from another thread on the topic where others are having this difficulty (for the game Wizardry 8 anyways, I am not collating all the potential issues):
https://www.gog.com/forum/general/wizardry_8_wont_lauch_what_do/page1

---
Right, let me try this again.
I am !!NOT!! talking about Galaxy or the Game Version (which is 1.2.4 in both cases).

So, OFFLINE installer setup_wizardry8_2.0.0.6.exe, which is no longer available under the download offline installers on the website, but which I have backed up works flawlessly. It also contains prebuilt characters and a Saves folder already in place. It also plays the movies fine and launches correctly.

setup_wizardry_8_2001_12_23_(22306).exe which is the one now available on the website for download has the following issues:
It screetches at each movie start.
It opens with resolution 1024*, whereas the previous one opened full screen.
It does not play the start movie, nor does it start the game, just crashes at that point.
The instal does not contain a Saves folder, has no premade characters.

I will add this information to the main thread, and wishlist and other links here:
https://www.gog.com/forum/general/provide_a_full_and_complete_changelogged_download_system

I can repeat the above as many times as needed, all exactly the same issues. Here is a directory listing of the two versions, which quite clearly show the second one is missing the Saves folder completely, and has a different size. As the game version has not changed, GOG have changed something between the two versions and removed content. I have asked GOG about this, they reply with the standard "use galaxy to be able to roll back":

setup_wizardry8_2.0.0.6.exe:
---
Volume in drive C is Windows
Volume Serial Number is

Directory of C:\MyGames\Wizardry 8

10/05/2020 10:58 <DIR> .
10/05/2020 10:58 <DIR> ..
15/10/1999 18:07 1,105,408 3DfxSpl.dll
15/10/1999 18:14 1,105,408 3DfxSpl2.dll
15/10/1999 18:21 1,105,408 3DfxSpl3.dll
10/12/2001 20:49 102,454 3DSetup.exe
20/03/2013 14:39 55 3DVideo.CFG
15/01/2001 13:41 286,208 binkw32.dll
15/01/2001 18:08 0 CD.ROM
10/05/2020 10:48 <DIR> Data
10/05/2020 10:49 <DIR> Dll
10/05/2020 10:49 7,732 EULA.txt
14/09/2012 13:56 96,264 GameuxInstallHelper.dll
21/05/2013 16:51 128,352 gfw_high.ico
15/02/2013 21:27 1,290,240 glide.dll
02/04/2013 16:20 1,302,528 glide2x.dll
15/02/2013 21:29 1,318,912 glide3x.dll
14/09/2012 13:56 69,248 gog.ico
24/05/2013 13:06 283,968 goggame.dll
10/05/2020 10:49 1,574 Launch Wizardry 8.lnk
10/05/2020 10:49 <DIR> Levels
16/10/2001 16:56 125,952 Mp3dec.asi
16/10/2001 16:55 348,160 Mss32.dll
16/10/2001 16:56 52,224 Mssa3d.m3d
16/10/2001 16:56 61,952 Mssa3d2.m3d
16/10/2001 16:56 65,536 Mssdolby.m3d
16/10/2001 16:56 51,200 Mssds3dh.m3d
16/10/2001 16:56 50,688 Mssds3ds.m3d
16/10/2001 16:56 51,712 Mssdx7sh.m3d
16/10/2001 16:56 51,712 Mssdx7sl.m3d
16/10/2001 16:56 51,712 Mssdx7sn.m3d
16/10/2001 16:56 54,272 Msseax.m3d
16/10/2001 16:56 70,144 Msseax2.m3d
16/10/2001 16:56 64,000 Mssfast.m3d
16/10/2001 16:56 354,304 Mssrsx.m3d
16/10/2001 16:57 142,848 Mssv12.asi
16/10/2001 16:57 134,144 Mssv24.asi
16/10/2001 16:57 161,280 Mssv29.asi
15/01/2001 13:41 77,878 MSVCIRT.DLL
15/01/2001 13:41 401,462 MSVCP60.DLL
15/01/2001 13:41 266,293 MSVCRT.DLL
10/05/2020 10:58 0 mytemp.txt
06/12/2012 14:32 227 nGlideEULA.txt
02/04/2013 17:11 53,248 nglide_config.exe
02/04/2013 17:11 15,179 nglide_readme.txt
10/05/2020 10:49 <DIR> Patches
10/05/2020 10:49 <DIR> Saves
13/09/2001 20:09 688,191 sr.dll
14/09/2012 13:56 62,895 Support.ico
10/05/2020 10:49 239,256 unins000.dat
10/05/2020 10:47 1,233,216 unins000.exe
10/05/2020 10:49 1,009 unins000.ini
10/05/2020 10:49 22,733 unins000.msg
20/03/2013 14:06 2,063 Wiz8.CFG
24/12/2001 02:01 3,580,513 Wiz8.exe
06/10/1997 04:11 2,238 Wiz8.ico
26/12/2001 14:34 6,188 Wiz8Patch2001_12_23_README.txt
10/05/2013 12:11 591,849 Wizardry 8 - Manual.pdf
51 File(s) 17,340,037 bytes
---

setup_wizardry_8_2001_12_23_(22306).exe:
Volume in drive C is Windows
Volume Serial Number is

Directory of C:\MyGames\Wizardry 8

10/05/2020 11:12 <DIR> .
10/05/2020 11:12 <DIR> ..
10/05/2020 11:10 1,105,408 3DfxSpl.dll
10/05/2020 11:10 1,105,408 3DfxSpl2.dll
10/05/2020 11:10 1,105,408 3DfxSpl3.dll
10/05/2020 11:10 102,454 3DSetup.exe
10/05/2020 11:11 55 3DVideo.CFG
10/05/2020 11:10 286,208 binkw32.dll
06/03/2018 13:27 0 CD.ROM
10/05/2020 11:11 <DIR> Data
10/05/2020 11:10 <DIR> Dll
10/05/2020 11:11 36,796 EULA.txt
10/05/2020 11:10 1,527,808 glide.dll
10/05/2020 11:10 1,617,920 glide2x.dll
10/05/2020 11:10 1,712,128 glide3x.dll
09/08/2017 16:28 69,248 gog.ico
10/05/2020 11:11 3,112 goggame-1207659230.hashdb
10/05/2020 11:10 128,352 goggame-1207659230.ico
10/05/2020 11:11 1,214 goggame-1207659230.info
10/05/2020 11:11 1,615 goggame-1207659230.script
10/05/2020 11:11 631 goglog.ini
10/05/2020 11:11 1,592 Launch Wizardry 8.lnk
10/05/2020 11:11 <DIR> Levels
10/05/2020 11:10 125,952 Mp3dec.asi
10/05/2020 11:10 348,160 Mss32.dll
10/05/2020 11:10 52,224 Mssa3d.m3d
10/05/2020 11:10 61,952 Mssa3d2.m3d
10/05/2020 11:10 65,536 Mssdolby.m3d
10/05/2020 11:10 51,200 Mssds3dh.m3d
10/05/2020 11:10 50,688 Mssds3ds.m3d
10/05/2020 11:10 51,712 Mssdx7sh.m3d
10/05/2020 11:10 51,712 Mssdx7sl.m3d
10/05/2020 11:10 51,712 Mssdx7sn.m3d
10/05/2020 11:10 54,272 Msseax.m3d
10/05/2020 11:10 70,144 Msseax2.m3d
10/05/2020 11:10 64,000 Mssfast.m3d
10/05/2020 11:10 354,304 Mssrsx.m3d
10/05/2020 11:10 142,848 Mssv12.asi
10/05/2020 11:10 134,144 Mssv24.asi
10/05/2020 11:10 161,280 Mssv29.asi
10/05/2020 11:10 77,878 MSVCIRT.DLL
10/05/2020 11:10 401,462 MSVCP60.DLL
10/05/2020 11:10 266,293 MSVCRT.DLL
10/05/2020 11:12 0 mytemp.txt
10/05/2020 11:10 227 nGlideEULA.txt
10/05/2020 11:10 348,160 nglide_config.exe
10/05/2020 11:10 23,016 nglide_readme.txt
10/05/2020 11:10 <DIR> Patches
10/05/2020 11:10 688,191 sr.dll
09/08/2017 16:28 62,895 support.ico
10/05/2020 11:11 1,741,516 unins000.dat
10/05/2020 11:11 1,334,880 unins000.exe
10/05/2020 11:11 41 unins000.ini
10/05/2020 11:11 23,077 unins000.msg
18/07/2018 12:25 313,764 webcache.zip
10/05/2020 11:11 2,063 Wiz8.CFG
10/05/2020 11:10 3,580,513 Wiz8.exe
10/05/2020 11:10 2,238 Wiz8.ico
10/05/2020 11:10 6,188 Wiz8Patch2001_12_23_README.txt
10/05/2020 11:10 591,849 Wizardry 8 - Manual.pdf
54 File(s) 20,161,448 bytes

Have you addressed this with GOG in a ticket? What do they say?

Yes, but can't they understand that the game downloaded by the "optional galaxy client" aren't working?

Not sure what you mean? I am only talking about offline installers, in my case obtained via the website. I do not use galaxy at all for anything nor would ever have it installed on my machine. If you have issues with galaxy, check the galaxy forum.

Pretty sure the point is that if the game is not working via the "backup" offline installers downloaded through the browser (i.e. without the "optional Galaxy client", the "optional Galaxy client" is not all that optional.

For whatever its worth, I was encouraged by the response I got regarding the new Deus Ex. For the King has been fixed (albeit after months of not working without Galaxy, iirc). Let's hope there is more effort going forward.

Probably the more people complain, the likelier things get fixed. If nobody complains, they won't

That's pretty much the reply several of us got back with tickets surrounding the unfixed bug in the newest Divinity Original Sin offline installers. "Just use Galaxy" as it can roll-back to an older version = GOG clearly still have the older build available to download, it's just a case of laziness in not posting a download link. Fortunately I've long learned to not delete older installers until new ones have been tested and managed to find the last good one (and since then have also adopted an "If it ain't broke, don't 'fix' it" mentality in actively not upgrading for the sake of version number chasing). Good luck with getting that fixed without being told to use 'optional' Galaxy though.