NO SDLIf you have a [NO SDL] file error, you can fix this by cleaning your steam cloud, to do this follow these steps.
1. Find CtA: Gates of Hell in your steam library
2. Right click and select properties.
3. Select launch options and enter exactly as follows
-reset_cloud_profiles
4. Now locate Documents / My Games / Gates of Hell
5. You will see a profiles folder, rename this folder to anything you would like i.e. profile2
6. Launch the expansion.
Not seeing Gates of Hell under My Games folder? Follow the steps here.
In some cases the CtA: GOH folder will be located in the local app data section.
You can locate this by opening the windows cmd prompt window and typing
https://steamcommunity.com/sharedfiles/filedetails/?id=2515262536