I just left the rwgmixer alone. Generated the world, opened biomes.png in Krita.
Used the "Select color" tool, clicked on orange - then used the subtract selection lasso to deselect a couple spots.
Filled the section with forest green.
Did the same for purple.
Saved file.
Result:
Works...
No dtm.tga heightmaps exist or are generated [Mac OS X]
Summary: No dtm.tga heightmaps exist or are generated [Mac OS X]
Version: Alpha 17 Stable B240
Platform: Mac
OS/Version: Mac OS X 10.11.6
Game mode: SP RWG and NAV
Did you wipe old saves? Yes
Did you start a new game? Yes
Did you...