We are sorry you are having problems... But we won't help. Use the forum...
And the reasons for that should be clear - many people have tried to help in this thread; Stardock representatives included.
Baring any in-game restrictions (tech research, etc), my input would be to rename:
C:\Program Files (x86)\Steam\steamapps\common\Galactic Civilizations III\DLC
to:
C:\Program Files (x86)\Steam\steamapps\common\Galactic Civilizations III\DLC.OLD
Then do a verify:

This is going to take some time...
Let us know and thank you for your patience...
Sean Drohan
Stardock Support Manager