No need for the update unless you are interested this one thing.
-- Added grassfx entry. The original config did not have an entry for grassfx. If you prefer not to use the grassfx, open up the ext_config in a notepad editor and scroll to the [GRASS_FX] section at the bottom. Change ACTIVE = 1 to ACTIVE = 0.
-- If you want tweak the vibrancy of the fall colored trees, open the ext_config file and look for this section:
[MATERIAL_ADJUSTMENT_32]
MATERIALS = Deciduous?
CONDITION = SEASON_AUTUMN
KEY_0 = seasonAutumn
VALUE_0 = 1.50
OFF_VALUE_0 = 0
ACTIVE = 1
DESCRIPTION =
Raise the VALUE_0 number to increase the vibrancy or lower it to decrease the vibrancy. Go in .05 increments either way to start with., then test and adjust.