In the future, the shipping platforms will update there API to the new version or your e commerce platform is upgrading their versions, you may lose the compatibility of the plugin. Better to be subscribed for module updates & premium support to avoid the issues.

Yes, Module works fine for your lifetime. The benefit on subscription is, you always get compatibility & API updates of the module. Without subscription you will not get support & updates for the module after the year from purchased date.

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