It depends, if you have a valid upgrade key in place then you will not require any additional keys and may simply run the upgrade. If you do not have a valid upgrade key then
you will need to purchase one and apply it during the upgrade process in order to allow the upgrade to procede correctly.
If you have already purchased an upgrade key you should be able to see the expiry date of this key from the System > Key page.
Upgrade keys are valid for a period of 12 months from the time of purchase.
Keywords:upgrade, key, new