Switching from a monthly to a yearly subscription is simple:
Login: Log in to your account either in Web or Desktop MeshInspector apps.
Subscription Settings: Access your subscription settings.
Go to Home tab -> About
Click Account Button
You will be redirected to your subscription settings page.
Click on your current subscription plan.
Change Plan: Look for the option to change your subscription plan and select the yearly option.
Press Edit subscription, then press Change->
Choose Yearly plan and press Update button.
Proceed with payment.
Your subscription will be updated accordingly, and you'll enjoy the benefits of an annual plan.