Unzip the contents of the folder FJBattles to \Close Combat The Bloody First\Campaigns\MAIN\DATA\BATTLES.

Unzip the contents of the folder FJOperations to \Close Combat The Bloody First\Campaigns\MAIN\DATA\OPERATIONS.

To revert to the original TBF file install:

unzip the contents of the folder oBATTLES to \Close Combat The Bloody First\Campaigns\MAIN\DATA\BATTLES

unzip the contents of the folder oOPERATIONS to \Close Combat The Bloody First\Campaigns\MAIN\DATA\OPERATIONS