When upgrading or downgrading, do you credit the amount already paid toward the next purchase? - Yes.
If you upgrade your subscription, the subscription cost will be prorated. Please note that the subscription billing cycle has to be the same. You will be charged the difference between the cost of your old plan and the new one for the remainder of your subscription. If downgrading, the remaining balance will be applied and the subscription duration will be increased. Please note that subscriptions are not prorated if paid for by wire.