Switch to Premium version

I bought the Premium version of this plug-in a few years ago. I have a new website, and I’d like to use plug-in there instead. Basically, I want to use the free version on the old website but the premium on the new one. Is there a way to deactivate it on the old one, and activate it on the new one?

https://www.ads-software.com/plugins/testimonials-widget/