I'm unable to get this tool to work. I have the latest version, and after following all the steps, when I open my level again the terrain is unmodified.
I have used 500x500, 1000x800 (as the example in the tool states) and 800x800 terrains.
I resize my heightmap correctly (251x251 for the 500x500 terrain, etc). I tried PNG, BMP, JPEG. I tried modifying the 'Height of black/white pixels' in the tool.
Nothing so far has resulted in anything showing up in the editor once I reopen it.
Do I need to do anything to the terrain besides creating a new level, creating a terrain with a base material and saving?