Federation and Empires DLC wont work after purchase with Epic Games

I have owned Galactic Civ 4 for many years.  I purchased from Epic Games.  I pucrhased Federation and E,pires from Epic Games in the same account.  It will not allow me to play federation and empires.  Customer support says the problem is with Stardock and I should contact Stadock for help.  Epic Games support says Federation and Empires only starts to work when you reach a certain point in Galactic Civ 4 base game which is not true.  Has anyone else had this issue?