Debug Message: CSDFModelCore::LoadModelData has detected an SDF file that is an older version of SDF than expected: D:\Steam\steamapps\common\Galactic Civilizations III\Gfx\Models\Components\Meshes\ColonyModel_WeaponTexture_A_01.sdf
If you delete the SDF and then verify the game does it work then.
Grabbing at straws.