For anyone having this issue, download: http://sd.stardock.com/sean/activate/SDActivate.exe
Navigate to the directory of the application you are trying to activate:
C:\Program Files (x86)\Steam\SteamApps\common\Demigod
C:\Program Files (x86)\Steam\SteamApps\common\Galactic Civilizations II - Ultimate Edition
C:\Program Files (x86)\Steam\SteamApps\common\FE Legendary Heroes
C:\Program Files (x86)\Steam\SteamApps\common\Sins of a Solar Empire Rebellion
C:\Program Files (x86)\Steam\SteamApps\common\Sins of a Solar Empire Trinity
C:\Program Files (x86)\Steam\steamapps\common\Elemental Fallen Enchantress
If you are running on a 32 bit machine, it will be 'Program Files'
Rename the existing SDActivate.exe to SDActivate.exe.old
Copy the new SDActivate.exe to that directory.
Run the game you need to activate (not SDActivate.exe) and fill out the form.
If it fails with the same error please let us know so we can try to address the issue further.
Sorry for the trouble.
