At any time you can change your subscription to a higher plan. We will charge you the proportional part of the price increase corresponding to the remaining days of your billing period (monthly or annual). When you renew your subscription (monthly or yearly), the new plan will be applied as default.
However, it is not possible to downgrade to a lower plan. If you need to downgrade, please contact us at support@scormtools.net and we'll let you know how to do the process.