This mod makes the race/hull/module unlocking process more lengthy and satisfying, it progressively unlocks DLC missions, and it provides some non-gameplay-altering tweaks/fixes.
Extract the "Data" folder so that it overwrites the folder with the same name in the main game folder. Do the same for each of the remaining folders, but skip the folders corresponding to DLCs you don't have (ex: if you don't have the Tribes DLC, don't copy the "tribes" folder into the main game folder, or you'll most likely get errors ingame).