Open the "SinglePlayer" folder.
Open the "BMGame" folder.
Open the "Config" folder.
Locate the "BmEngine.ini" and open it with Notepad.
Once you've opened "BmEngine.ini", press the Ctrl key and F key at the same time, and search for "DetailMode".
You should be moved to a line that states "DetailMode=0". Change this line to "DetailMode=2, and then click "File" at the top left, and choose "Save".
Fixing the Shadows.
Open "BmEngine.ini" again, and once you've used Ctrl + F, search for "MaxShadowResolution=".
Once you come across it, change "MaxShadowResolution=256" to "MaxShadowResolution=1024".

Click "Flie" at the top left and choose "Save".