Install steps: RDD for DH V1.2
1) Purchase and Install Darkest Hour
2) Create a NEW folder called RDD inside the Darkest Hour Mods Folder.
3) Copy contents of RDD_for.DH.V1.2rar (open with 7zip) into - Darkest Hour\Mods\RDD
4) Launch Darkest Hour and look for RDD in the "Load a Mod" window.