How to install JW Player? Is JW Player free?

I wanna play videos with JW Player. Videos are hosted on an external server. If possible, what is https://rkimovies.net/watch/? and how can I make this script or whatever it is? The site is using the script to play videos with JW Player which are hosted externally.

Last question: Do I need to pay for JW Player?

Here's the JW Player pricing details: https://www.jwplayer.com/pricing/

Looks like a commercial license will cost you, although I'm quite sure there's a nulled version out there somewhere.

Maybe request it here on BHW if it's not on the list of forbidden software?

Read their documentation. You gonna need to pay for it if you want to get updated every time they release a new version. Not cheap though. I’m using the paid version but personally I think it’s not worth buying if it’s regular use.