When you install HackShield, you automatically get a free version of the application with unlimited traffic to 4 countries.
You can subscribe to the paid version for unlimited traffic to multiple countries.
The subscription of the app has an option of auto renewal. It will be renewed at the end of the subscription period unless you cancel it. You can opt out of using auto renewal and renew the yearly subscription manually. This feature is available inside the app settings. If the subscription is not renewed, the app will switch back to the free version.