As Mike said you can unsubscribe as soon as you have paid and you will still have access for the paid period.
Officially you can do it right up to the last second however we recommend 72 hours in advance to give us chance to get to you before payment is taken should anything go wrong and you need support
Marketing RSMG
We would like to subcribe for one year. When do we have to unsubcribe before the next year starts?
Thanks & best