I changed PCs recently and downloaded Stardock Central. It installed fine, loged in. Gal Civ 2 came up under purchased software so I clicked the button to install it. I get the following:
-- [Application] ----------------------------------------------------
Name: 		Stardock Central
Path: 		C:\Program Files\Stardock\SDCentral
Version:	2.33.401, build: 130
-- [System Information] ---------------------------------------------
Platform:	Microsoft Windows Windows XP, 5.1.2600 Service Pack 2
System Dir:	C:\WINDOWS\system32
Time / Date:	14:03:29 -- Tuesday, May 09, 2006
-- [Installing] -----------------------------------------------------
Server:		http://sdcentral.stardock.com
Server Dir:	public
Network Id:	drengin
Name:		Galactic Civilizations II
App Id:		gc2
Installed:	False
Version:	1.11[b].005
Type:		beta
Reg Key:	GalCiv2
Install Dir:	C:\Program Files\Stardock\TotalGaming\GalCiv2
Exe:		gc2launch.exe
Last Updated:	05/08/2006
-- [Account] --------------------------------------------------------
First Name:	John
Last Name:	Langer
Email:		jlanger@gmail.com
Error:		Attempt: 1 | Account information invalid
Error:		Attempt: 2 | Account information invalid
Error:		Attempt: 3 | Account information invalid
Server:		Using other server http://sdcentral2.stardock.com
Error:		Attempt: 1 | Account information invalid
Error:		Attempt: 2 | Account information invalid
Error:		Attempt: 3 | Account information invalid
Server:		Using other server http://sdcentral4.stardock.com
Error:		Attempt: 1 | Account information invalid
Error:		Attempt: 2 | Account information invalid
Error:		Attempt: 3 | Account information invalid
Result:		Installation failed (9)