Downgrade: If you downgrade from a paid membership to another, you will retain your current membership until the period expires. After that, the new, downgraded membership will take effect with the new prices.
Upgrade: If you upgrade from a paid membership to another, the upgrade will take place immediately. The new prices will apply directly to your upcoming bookings. The charge for the new membership will occur immediately, and you will receive a refund for the remaining amount from your original membership.