Thanks for reaching out to me, Adrian. Please go to the current subscription page (https://www.cameraftp.com/secure/SubscribeHistory.aspx) and select the Order ID for your subscription. Within this page, you will see an option to 'upgrade'. You should be able to follow the next steps directly to upgrade your subscription.
If you have any continued issues, please send an email to firstname.lastname@example.org so we can help you more comprehensively with any issues you're having.