Oh I see now when I open the .tgd accompanied by the tutorial.
I kind of accidentially saved the settings of the end stage of the tutorial.
To be more precise. I saved the tgd file at frame 240 of the animation.
Frame 1 produces the result I'm referring to in the tutorial.
Frame 240 produces what you and dhaval see.
Apparently non-animation versions of TG2 use the settings at the current keyframe it was saved when animated.
Change the constant colour to 0.1 and set the cloud altitude offset to 100 and centre 0..1 to 0.
This should give the exact same image.
After completing the tutorial you should be able to figure this out yourself