1. Open Mapweather.bat and choose one of the options 
2. Enter a number from 1 to 5 (example:if you press 3 and press enter the rainy weather mode will be selected)
3.Press any key and the program will exit.The games files are updated.
4.    VERY IMPORTANT
       Go into the map folder (eg:   C:\racer0933\data\tracks\eastern_europe_driving) and copy the fallowing FILES(4 files) to the TOD folder (eg:   C:\racer0933\data\tracks\eastern_europe_driving\tod).Attention: DONT MOVE THEM,COPY THEM,THE SAME FILES HAS TO BE IN THE MAP FOLDER AND IN TOD FOLDER.

  THESE FILES(4 files):

extinction_factor.crv
mie.crv
rayleigh.crv
sun_intensity.crv

5.Now the weather mode is fully updated and you can play the map.