Here is a short video describing how to import the files you created in World Machine. The files are 8K (8192 pixels) and you can get them here:

https://www.dropbox.com/sh/lzkxrx5v0i8v6qk/AAAkKyo3XiyxT5wsMYMIpnA4a?dl=0

The texture forms the base and by adding shading and masks you will have a setup ready for further editing.