sorniak: Ok, guys...that might be oddly- but I think, I know how to make it work. My friend has bought this game and we spent some time to make it run on Win 8 pro 64bit. The solution is following:
1. install haegemonia somewhere, lets name it "Location 1".
2. initiate another installation of haegemonia, but to another place, lets name it "Location 2"
3. uninstall haegemonia :) (Win+X -> programs and functions -> uninstall it :)...
4. go to "Location 1" - here should be the copy of haegemonia which survived uninstall (cause uninstall in programms menu deletes the latest copy only). So, go to foulder with haegemonia and run it via Hgmaexe or Hgmexe - not gogwrapexe!!....

That way we made it work. It seem to be some parameteres gog team provided for the game are incomptible with Windwos 8. Well....probably you can also make it run just cleaning the registry from haegemonia's param-s?...

One naughty drawback of this method: the original "haegemonialegions of iron" will start asking for Cd-Key...

sorniak: Ok, guys...that might be oddly- but I think, I know how to make it work. My friend has bought this game and we spent some time to make it run on Win 8 pro 64bit. The solution is following:
1. install haegemonia somewhere, lets name it "Location 1".
2. initiate another installation of haegemonia, but to another place, lets name it "Location 2"
3. uninstall haegemonia :) (Win+X -> programs and functions -> uninstall it :)...
4. go to "Location 1" - here should be the copy of haegemonia which survived uninstall (cause uninstall in programms menu deletes the latest copy only). So, go to foulder with haegemonia and run it via Hgmaexe or Hgmexe - not gogwrapexe!!....

That way we made it work. It seem to be some parameteres gog team provided for the game are incomptible with Windwos 8. Well....probably you can also make it run just cleaning the registry from haegemonia's param-s?...

One naughty drawback of this method: the original "haegemonialegions of iron" will start asking for Cd-Key...

BondKitty: I would like to second a request for the GOG team to solve this issue. It's proving rather frustrating.

ozgurcakmak: Either runs with the latest update OR the same trick with the SOTS The Pit worked here.

Namely:
Instead of installing into C:\GOG Games\Haegemonia - Legions of Iron, do an install in C:\GOG Games\Haeg

I did and it is working like a breeze.

savvart: I've tried everything suggested and it will NOT work at all. Just keeps dropping back to the desktop. I'm running Windows 8.1 x64

Help and thx

ozgurcakmak: Are you running the exe with admin privileges?

Edit:
Never mind, I am downloading the game again. You are trying to run Haegemonia - Legions of Iron, right? Not Solon Heritage?

Edit2:
It works on my end with the solution I proposed. I ran the installer, selected "Options" changed the install directory to GOG Games/Haeg and launched it post install. And finished the first mission to see whether it will crash on me.

What hardware are you trying to run it on?

savvart: I'm running it with admin privileges yes. And have tried without as well...
Yes, I am trying to run Legions of Iron.
As for hardware:
Intel i7 3770K
nVidia GeForce 670GTX 2 GB ram
16 GB - 1600mhz ram
ASRock Motherboard
Vertex4 - 512GB SSD
Windows 8.1 x64

Hope this helps narrow down the issue?!?!
Thanks for your help

ozgurcakmak: Ah... I am kinda stumped then. Because your rig and mine is kind of similar, and what do you experience? You see the videos but cannot start the game or you do see the vids, the menu but the game crashes on you? When does it crash in short...