you can play
p5.js / index.html / sketch.js
local on PC using browser with double click on index.html
just for some basic drawings…
as soon you want line load files like picture/sound files
your browser need to see a server
see Image files loading issue here most easy way
but, did you try use the Processing IDE 3.5.3 // p5.js Mode //
( yes not easy copy between a downloaded p5.js online editor project / PDE procject )
there also the server tool is build in.