I keep entewring my serial key in the little form to update sins of a solar empire, but it isnt working. I tried downloading the stardock centeral thing and it said update to version 1.05 or something like that. I am on version like 1.00 and i wanna update. So i clicked update and it still wont work! it says it is invalid, please check serial number if it is entered correctly! but i cannot put it into this website. What do i do!

This is frusturating, but if you respond thank you so much