Hello, today I completed my collection and bought Quake III Arena and Quake 4 on promo. As always I headed to GOG Galaxy to download standalone installers but by default my Quake III page on Galaxy had greyed out install button and had no extras to download installers. I noticed some "stack" button on the left and there I have 2 versions of Quake to choose, both having the same name. Exactly the same condition affects Quake 4. Second versions of games from the stack are installable and contain extras tab. Any idea why it's like that? I'm just curious and maybe there is some sense behind that. :P

Do you own these games on different storefronts such as Epic Games Store?

Nope, I own Quake games only on GOG and only these 2 I bought via redeemed code from email have such strange condition.

Interesting that in case of Quake 4 description between both versions differs while in Quake III both looks the same.

And you never have this games installed on this machine? In any legal or wares way?
Some temporary issue. While someone get this games disappeared... You have their copies! :p
Maybe try http://www.gog.com/account/refresh
not sure if this if work from and for Galaxy client....
Or http://gog.com/refresh .

I don't see any refresh button in Galaxy and on browser problem doesn't occur, there's just one version avaiable on my shelf. :) SInce there's some dedicated buttion for changing game versions I guess it's not simple bug but actually there must be reason behind it. :P I never ever had Quake 3 or 4 installed on these laptops (tried one with Windows 10 and one still on 7), I also don't have Galaxy integrated with any other platform, I keep all my launchers separated. Well, I contacted support about this issue and linked this topic. When I get reply explaining existence of 2 stances of the same game I'll share it here. Thx for replies!

According to GOGDB.org, there are two different entries for Quake 4: one for the game itself and one for a package containing the game. Note that this is not unusual: if I understand correctly how the system works, basically the store sells the package (not the game) and then Galaxy shows the game (not the package). This is convenient for managing actual bundles (such as The Humans Bundle that contains three games), but it's used for single games too (don't ask me why).

The unusual behavior in your case is that Galaxy is showing that you own both the package and the game contained in it, while should only show the latter. As a matter of fact the two corresponding entries in the GOG database (the one for the game and the one for the package) match the two different descriptions shown in the screenshots you attached. This also explains why you can install only one of them, clearly the game and not the package.
The case of Quake III is similar.

I'm pretty sure this is some sort of bug, but I'm not sure what triggered it: maybe it's only a temporary issue but I strongly suspect that it's related to the way you bought the games: if I understand you correctly, you used a discount code that GOG sent you via email.

Bug for sure. But did package related to it or not is unclear. It is unnormal. and all Bethesda games are package-based. Q1 by mistake have installer attached to pack downloads as well. There is old bundles of 'un-bundled tales' - unbundled but they all still have old bundled installers.

Galaxy never show such (that have files) bundles-packages... I guess there is galaxy relared argument in games API properties to indicate them as galaxy build (something related to supported OS, but separate entry for galaxy and offline builds - or in galaxy and store api (gogdb)).

GogDb have many issues, sometimes major (some games/dlc still missing from Db entirely wolfenstein chronicles+files), miss changes sometimes, misc content or even installers updates).

Bug is a bug. So anything can trigger it 50/50. Key redeeming version still looks more possible.

Wow, this sounds like legit explanation. :P Indeed what I bought was Quake bundle from email offer wtth redeem code. Since I already had Q1 and 2 I only bought and paid for 3 and 4. And only these latter ones are problematic, probably being entangled with bundle you mentioned. Thanks! Since not installable bundled version is set up as default it may be lil problem for some so let's hope GOG fixes it sooner or later. :P