I wanted to prepare Cyberpunk for a long train ride on which I might have no internet.
But as soon as I turn of my wifi, the game crashes as soon as I go into the game.

First I tried downloading the game through GOG Galaxy and as soon as I turned wifi off, then the game crashed.

Then I downloaded the offline files, installed again and also as soon as I didnt have internet: crash!

Thread 0 Crashed:: GameThread
…
5 libGameServicesGOG.dylib gs::WriteLog(char const*, …)
6 libGameServicesGOG.dylib gs::GameServicesGOG::SetRichPresence(char const*, …)
7 Cyberpunk2077 …
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Termination Reason: Namespace SIGNAL, Code 11 Segmentation fault: 11

Finally I tried heroic launcher (found this recommendation online), downloaded the game again but similarly: as soon as I turned the wifi off and went in-game: CRASH!

[AUTH] ERROR: Failed to refresh credentials
GameServicesGOG::SignIn: SignInGalaxy
GameServicesGOG::SetRichPresence: Failed to set rich presence
GameServicesGOG::AuthListener: Galaxy authentication failed
GameServicesGOG::EncryptedAppTicketListener: Galaxy request encrypted app ticket failed

The logs show its always when GOG wants to authenticate but how does this game have an "offline" version if it always needs to phone home to GOG to verify?

Kindly help me safe my trainride!

Don't know anything about a modern Mac, but assuming the install is the same as for PC, do you have the offline Cyberpunk2077.exe?
It's located in [X]:\Cyberpunk 2077\bin\x64

That skips the Red Launcher nonsense and GoG Galaxy.

Yes you can go into the Cyberpunk.app file and click the actuall starting file.

But that crashes even if I have Internet enabled, since the offline version is apparentlly still looking for GOG but can't find it since the offline version doesn't include it:

╰─➤ /Applications/Cyberpunk\ 2077/Cyberpunk2077.app/Contents/MacOS/Cyberpunk2077 ; exit;
Sep 27 11:54:09 Cyberpunk2077[6960] <Error>: GameServicesGOG
Sep 27 11:54:10 Cyberpunk2077[6960] <Error>: GameServicesGOG::SignIn: SignInGalaxy
2025-09-27 11:54:11.586 Cyberpunk2077[6960:1247020] Controller connected: <GCController 0x6000031081e0 '8BitDo Receiver>, controllerIdx:0
Sep 27 11:54:13 Cyberpunk2077[6960] <Error>: GameServicesGOG::SetRichPresence: Failed to set rich presence '(null)'
Sep 27 11:54:25 Cyberpunk2077[6960] <Error>: GameServicesGOG::AuthListener: Galaxy authentication failed, failure reason = 1870743168
Sep 27 11:54:38 Cyberpunk2077[6960] <Error>: GameServicesGOG::SignIn: SignInGalaxy
Sep 27 11:54:53 Cyberpunk2077[6960] <Error>: GameServicesGOG::AuthListener: Galaxy authentication failed, failure reason = 1870743168
Sep 27 11:55:26 Cyberpunk2077[6960] <Error>: GameServicesGOG::SetRichPresence: Failed to set rich presence '(null)'
[1] 6960 segmentation fault /Applications/Cyberpunk\ 2077/Cyberpunk2077.app/Contents/MacOS/Cyberpunk2077

Saving session...completed.

Do you have GoG Galaxy installed, and any sort of cloud saving enabled?
I know that has been a big issue for many with this game, with various errors and crashes.

And can you force the game to run in windowed mode on Mac? I personally find it much more stable in Windowed Borderless.

I haven't touched a Mac since an ancient G4, so I have no clue how to actually troubleshoot this.

I don't play Cyberpunk on my Mac, however this is what I did to be able to play BG3 in offline mode on my Macbook, maybe the Cyberpunk install works the same way?
Is there both a "Contents/MacOS/Cyberpunk2077" and a "Contents/MacOS/Cyberpunk2077 GOG" file? If so, it works the same a BG3.

- Install bg3 normally via Gog Galaxy. After install I disable galaxy from the login options.
- Navigate to the application file "Baldur's Gate 3.app" using finder. I install mine into MacintoshHD/Applications/Gog but I dont think it matters where.
- Within finder, click on the app file and select option 'Show Package Contents'
-- open subfolder 'MacOS', its within the Contents folder.
-- in there, notice the two files"
- Baldur's Gate 3 GOG (which is about 500 mb in size)
- Baldur's Gate 3 (which is about 200 Kb in size)
-- What happens is when you launch the app, it executes that smaller file first which then crashed out when offline. The easiest way I found to have it run the main executable is to just rename these two files!
--- Rename the file "Baldur's Gate 3" to something like "old_Baldur's Gate 3"
--- Now rename the file "Baldur's Gate 3 GOG" to be exactly "Baldur's Gate 3". So now when you run the game it launches the base game executable and no longer checks to be online.

Hope this helps