I try and it works! Got my key and redeemed!
Better take advantage of it while it still free!
Just click "Add To Account" and get your keys there. (Of course you gonna need to make an account there first if you haven't.)http://www.gamersgate.co.uk/DD-WL2TE/warlock-2-the-exiled
Apparently they have removed the game from GamersGate...