smuggly: OK I think things have changed You have more stuff listed there than I do. a lot more. Thanks Anyway. They must have changed it. I just bought it yesterday.
jsidhu has the expansions, while I do not, so my view looks a bit different from the one shown. Nonetheless, following the instructions posted above, I get to the page that shows the URL to redeem for my account. (Note that even if you get there, you have to solve a CAPTCHA, which is silly and oftentimes broken.) If you're still stuck, you could try contacting GOG support.
When I had to contact them about the broken CAPTCHA (always dies with an error for me, even when solved correctly), it took them four months of going in circles before I gave up. They never did figure out how to fix it, so I still can't redeem. :)