The dgn.rpa should be found inside the Cheat Mod folder (Lust_and_Power-0.37-cheat-modv2.4.zip) that you downloaded (which you get from Terrazero's link) and extracted then putting it inside Lust and Power's game folder.
It should be looking like this (I hope this helps):
Lust_and_Power-0.37-cheat-modv2.4.zip:
View attachment 1044776
Lust_and_Power-0.37-Elite-Mod.zip:
View attachment 1044778
Lust and Power Main Folder:
View attachment 1044779
Lust and Power/game folder (where you should put in both mod files):
View attachment 1044780