I bought this online from you, and it's asking for a CD key now to regiester it with Eugene Systems. Where is it or what can I do? Thanks for the help.

In your GOG download library, after opening Steel Division 2, to the right of the System: Windows and Language: English (or whatever), you have a "More v" dropdown. "Serial Keys" should be the second option. Your key should be there.

Can you , please add a screenshot ?

I don't know where it is in GoG Galaxy, but on the website, click on the game, then "More" -> "Serial Key", as explained in support article #360010674374 (the forum won't let me link to their own damn support site ...)

See attached screenshot.

Edit: I forgot to mention: If you already have an account with the publisher, click "link" ingame (instead of "connect" or "create"), and it'll ask you for a serial key. 2nd option from the left, if I recall correctly.

can anyone explain how to get a cd key, i have it installed on gog galaxy, when i launch the game it asks me to create a account and i have no clue where to find the cd key, or the more button everyone keeps talking about

I can't find key in GOG GALAXY too.
But you can find the "more" button and cd key on gog website(http://www.gog.com/account).
DarkUranium' Floor 4 attached a screenshot which is correctly showing the interface if you click the STEEL DIVISION 2 on the GOG website above.

i cant find the CD-key can someone help me?