[The Fifth Horseman]

I think this should be it: https://eu.battle.net/account/manage...laim-code.html

Or perhaps this if the above doesn't work: https://eu.battle.net/account/manage...laim-code.html

After entering the serial, you will be able to download the digital version of the game to your PC (the download utilizes BitTorrent, but is keyed to your IP - you'll need to redownload the downloader every time your IP changes; at least that's how it was last year). The old CD Key is no longer usable with this version, there's a new key you will find on your BN account page for the game.