Distance Field Shadows not working with directional lights

Yea same problems here i tried these steps and before this i used the Distance field test file provided by Tim Hobson.

55572-df_test.zip (2.52 MB)

I have yet to try using unreal engine 4.7
as im out of space on my system disk drive so im wondering if can i install unreal engine 4.7 on another hard drive?