I have bought the fight through Now Tv got the voucher but can't put the voucher number in and it keeps asking me to sign in but doesn't recognise my email.
Have you gone to http://www.skysports.com/boxofficelive and chose the option to buythe fight? This lets you set up a Sky Box Office account (if you already have one sign in with your details instead) and on the payment page choose the option to redeem your code.
It's your Sky Box Office login you need to use to watch the fight.
