The easiest way is to install all of the files from Imperial_Civil_Warr/Data into your Forces_of_Corruption/Data folder. Then when you run the base game, it runs the mod, and you'd be able to run it through Hamachi or Gameranger how you normally would. You should make a backup copy of your data folder, too (I personally keep one named Data and then just rename whichever I'm not currently using to Data - ICW/Base).