Draknost, do the version numbers match in the error messages and what Stardock Central is showing? There's probably something wrong with your registry entries.
If you go to HKEY_LOCAL_MACHINE under Software\Stardock\Drengin.net\Galciv2, check the string in the Version key, it should be 1.50.128 or higher. Then go to the Dark Avatar branch and check the version string there.