Please help, this might be a dumb question, but just want to make sure before I purchase from bitdefender.com 
I have Bitdefender Internet Security 2010 64 bit edition currently installed on my pc.
I need to renew my licence, but the only licence keys available is 2012 editions.
Will a 2012 Internet Security licence key work on my 2010 edition, or will I need to purchase a 2010 I.S. key?
And if so, where on bitdefender's website might I find a 2010 key?
Your help will be appreciated. Thanks