There is also a (modified) example in the collection. https://hofk.de/main/discourse.threejs/2018/SurfaceGometry/SurfaceGometry.html
When I just looked at it, the texture was missing. With the basic examples I actually always copy the textures to avoid missing links. I probably had overlooked that in this example.
UV_Grid_Sm.jpg
In the extended examples, they are only links.
I have copied the texture now and also renewed the zip file for 2018.
The problem is that the textures in the example folder have been changed. So you always have to use the appropriate revision as a basis.
There is a very extensive discussion about such problems: I wonder how many trees get burnt down and kids get neglected from three.js churn