Well use a proper up-to-date version and not one 6 years old if you want updates from 23 days ago.
Where are you downloading this antiquated plugin? It's not going to work in PLi either.
Really sounds like a case of driving a 30 year old car because that is the only one your seat covers fit.
Well, if the Movie Browser plugin is THE only front end plug in used to control your movies, is like more a 30 years old car because the steering wheel is the only your pole fits. And the "antiquated" plugin from downloaded on the PLi git few months ago.
Anyway, problem solved, I got now a Movie Browser adaption for Python3 ;-)