ah... alright.. my bad.. been a while since I poke joiplay RTP..
you dont need to extract RTP.. just download it.
here's the official guide to RTP from joiplay
you can check it yourself from joiplay menu > help
so extract game > apply patch > setup RTP
some people have very potato pc or want to play on phone because they can play it anywhere...
or maybe like me who swap save file.. play on pc > transfer save to phone > continue playing when im outside > go back home and transfer save back