[THEBERBSTER]

Hi Radox
The TWoS installation program installer is quite straight forward and includes a STEAM conversion.
From your post it would appear you already have a problem with your STEAM download?

Did your remember to do this.
Post #5 Update SH5 From v1.0.5.0 To v1.2.0 Immediately After Installing > Pictorial

And this?
Post #417 How To Run The SH5.exe As Administrator > Pictorial


Another option is to buy a different download which is not expensive.
Peter