Hi @SixOfNine,
Welcome to the Enpass Community.
Pro users on our platform will not be charged again and will never be forced to subscribe. Enpass does encourage its Pro Lifetime License holders to upgrade to Premium Lifetime License as it includes robust security features like 2FA Identification and Breach Monitoring, License conversion is completely user's choice and Enpass will respect that.
The idea is not to take anything away from you as we go along, but to give you more security features. We do provide a discount to our registered Pro users (only) for upgrading to Premium. To know more about this contact us at support@enpass.io.
We will continue to add more Pro-features without any additional cost, recent Pro-feature which we launched was Sync over WiFi (Cloudless Sync)