Bison Terrain Analysis


I’m trying to get a hachure map like this Grasshopper 7: Terrain analysis with Bison - YouTube
I tried to follow the video closely but still can’t produce the hachure lines. Not sure if it’s because I used the DEM tiff. (appeared as the red topography in screenshots) downloaded from bison example file. If so, where can I find a proper dem for my topography?
I have also tried connecting [mesh in flow] to [mesh box] instead of [rotate] and [import mesh dem] but nothing happens.
I have no clue what’s going on…Please help this grasshopper noob.

Thanks a lot.