Upgrading to NS - does it automatically link to account

Hello I am about to upgrade to NS from NIS (my annual subscription is about to run out anyway). My intention is to just follow the upload instructions and put it on top of my current NIS install. So, will this new installation automatically be linked/connected to my account? And how about then putting it on other machines (I have a five machine licence). Will they then also be linked to my account. I am sure this has been asked before, but I am really after a "walk through" to give me confidence. Thank you