Updating NIS 2009 - 2010

I have some questons. when I want to upgrade to 2010, I must download the trial right? do I need to put my credit card number? If so, when I put my product key, will it cancel buying another subscription after the trial is over? Im sorry for all these question. I hope I can get an answer. Thank you.

 

[edit: Clarified subject.]

Message Edited by shannons on 10-23-2009 01:07 PM