I have the answer to your problem! This link leads only to the Demo Version, and the Demos only have the scenes of the free area, not the purchased ones. I think they only put the files of the free part in it.
For example: If a demo game is only playable till Chapter 2, it will only have these 2 scenes inside of it. There are no scene 3,4,5 in this version. While the full version has all the scenes put into scenes folder.
So if you want to check the scenes of the entire game, you do it on the link of a paid version. Now I don’t know how or where you downloaded it from. Try re-downloading it.
If you still don’t understand, and I know you won’t because I explained it very poorly. , tell me.