My Ninja popup not work

My Name is Ravi Gupta i had bought a plugin from and it was for life time but now i see that plugin is saying that to buy license so how is this problem coming to us out of this problem have to leave

But I uninstalled it from one of my websites and installed it in another website, only then this problem is coming, tell me how we can solve this problem.

This- Popup Plugin for WordPress - Ninja Popups by arscode | CodeCanyon

Best regards
Ravi Gupta

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