Giveaway doubt

Not sure, it should accept the link. If not... you'll have to do it old school, sending the link via email to the winner.

You can make link to key :P thats what i did :P

open link ,enter your email ,then go to your email,open that link ,click on steam icon and it will show you key ,worked for me :)

yes but you can make it key :P do the same as you want to reedem it :P ,just enter your email and then press steam icon not to make link again :P then you got key :)

Steam disabled that interface. Humble Bundle does not redeem directly to your account anymore.