I'll paste in the full post: this is mostly meant for Win7 users, so I don't think it will help here, but no harm in trying.

posting your full system specs would also be a good idea.

My system is as follows,

intel core i7 3770 CPU
Gerforce GTX 970 with latest 399.07 drivers
16.0 GB system ram
Up to date Windows 10

I've tried the tips such as installing VC++ 2015, OpenAL etc. None of it works. I've copy pasted the following text from a file in the game directory (stdout.txt) that seems to be some kind of error log.

00:37:34: SDL Initialized
00:37:34: Cvar System Initialized
00:37:34: Runtime Object Initialized
00:37:34: File System Initialized
00:37:34: Warning: kexengine.cfg not found
00:37:34: kexPakFileLocal::LoadZipFile: Loading C:\Program Files (x86)\GOG Galaxy\Games\System Shock - Enhanced Edition\\sshock.kpf
00:37:34: Archive key built 0c2af3e546b380046977e022b8155163e6d18654
00:37:34: Input Initialized
00:37:34: Parallel Job Manager Initialized
00:37:35: MIDI System Initialized (Win32)
00:37:35: Available video displays: 1
00:37:35: Display monitor: MITSUBISHI TFT RDT234WLM (Digital HDMI)
00:37:35: Video Initialized
00:37:35: Initializing Rendering Hardware Interface
00:37:35: Dedicated Video: 3072MB
00:37:35: Dedicated System: 0MB
00:37:35: Shared System: 1023MB
00:37:35: Vendor ID: 0x10de
00:37:35: Adaptor Feature Level: NVIDIA GeForce GTX 970 (11_1)
00:37:35: DirectX 11 Initialized
00:37:35: Deserializing progs/dxShaders.bin...
00:37:35: Running game session
00:37:35: Script System Initialized
00:37:40: ERROR!
00:37:42: Shutting down job manager system
00:37:42: Shutting down MIDI
00:37:42: Shutting down renderer
00:37:42: Shutting down file system
00:37:42: Shutting down cvar system
00:37:42: Shutting down SD

Hope this can help with figuring out the problem.

try uninstall and reinstall

Didn;t work for me.

Works fine for me, don't know what to suggest.

-never mind-

Yeah sorry, frustration boiled over for moment, was looking forward to playing this.

Why was the enhanced edition completely replaced by this broken source port?
They should at least give us the option to chose which version we want to play.
Good thing I keep GOG installers backed up.
Also, wasn't Galaxy supposed to give us the option to roll back updates, in case they brake something?
Now would be a good time to use this feature but I can't find it anywhere.
Not everyone will have the installer for the enhanced edition on their drive.

No worries, I've been on that end of the frustration stick myself

It isn't broken for me, but obviously some people are having issues, both here and on Steam. Be patient, I'm sure NightDIve is looking into it.

I created a new wishlist entry:

https://www.gog.com/wishlist/games/system_shock_keep_legacy_enhanced_edition_installers_nonsourceport

Go to settings, disable Auto Update and select the version you want.

Thanks for reminding me about this option! At least I can play the game until the Source Update is fixed.

Well I got it working!

Rather than using the galaxy client, I downloaded the manual installer, and installed it to a simpler path structure, in this case rather than the Galaxy client games file, I just installed it to C:\games\System Shock Enhanced Edition.

Finally got to the menu screen!

I manually downloaded the game (I generally don't use Galaxy) and installed to my own GOG Games folder. Is this possibly why my version works? It's worth a try.