If you're not here to help anyone & content in wasting time, fuck off somewhere else.
I only suggested you to be more clear in your OP, if you want someone to help you. Anyway it's up to you.
And you are right: I wasted my time trying to find a solution for you for the wrong version of the game. Lesson learned, I suppose.
Speaking of the System Shock remake demo, it's not here anymore: it was removed as per developer's request because they changed the game's engine from Unity to Unreal Engine. You can certainly still play it, but the final game will be very different.
I know this is not a solution to your problem, it's just a warning in case you don't know.
Maybe someone else can help you: good luck!