Upgrades or downgrades are not available during an active subscription. You will need to wait until your current subscription ends to change your plan, whether that means adjusting pricing or the number of permitted connections.
Alternatively, you can purchase a new plan at any time. However, please note that any new plan—whether purchased before or after your current subscription ends—will be treated as a completely new subscription. This means your login details for the new plan will be different from your current ones.
