Usually I'm not one to complain, especially when it comes to free stuff. But.... I received an email today at 7:17am notifying me of the deals and what not here on GoG. Something that immediately caught my eye right at the top of the email was a giveaway. All excited I clicked on the link which took me to the GOG site on a 404 error page. Befuddled I went back and looked at the email again and noticed the giveaway was over yesterday at 1pm UTC... The email I got today was announcing a giveaway that was over yesterday... Just my luck.

The email tardiness unfortunately happens quite often.

Check here for spare keys:
https://www.gog.com/forum/general/the_grand_mount_blade_aftergiveaway

Or, in case you haven't deleted the e-mail, simply follow fables22's instructions:
https://www.gog.com/forum/general/mount_blade_giveaway_series_sale_vote_for_best_skills_9538d/post123