Can't update the game

I tried to update my game to the newest version through impulse (right click the game->update), and encountered a chain of errors. Here is what I tried:

Error #1: "Your registration for this product is not valid. {new line} Would you like to edit your registrations now? Yes/No"

Clicked yes: I now see a table with the following titles 'application' 'email address' 'serial number' 'expiration date'.

There is only one line in the table: 'Elemental: War of magic', no Email, a serial code of 5*6 hexadecimal characters (excluding the '-') and under expiration date I see 'invalid'.

I tried to 'update registration', by entering my email address into the empty email field, but then I get

Error #2: "Product Registration Failed: The email address or serial number you entered is invalid. (ref. 204)".

Since the Email I inputed isn't faulty, I can only blame the serial. This is problematic however, since I bought the game digitally and don't have anywhere to copy the serial from.

Additional information:

Current version: 0.0 (1.09 if I'm not mistaken, but that's what it says). Note that I have played the game several times already, the last time being Nov' 25th 2010.

On the Stardock.com website there's an option to request serials for owned products. I tried it (after validating again my email, which I was asked to do for some reason), but in the mail I received there was no mention of Elemental... Here's a quote of the relevant text from the email:

Customer Name : [my name]
E-Mail Address : [my email]
=-----------------------------