Problems with jump function when moving from Adobe Flash to Animate

I am having difficulty with my ActionScript code. It used to work fine in Adobe Flash but now I have had Animate installed instead it's stopped working. Has anyone had similar problems?

It's the jumping code

stage.addEventListener(KeyboardEvent.KEY_DOWN, jump);

function jump(e:KeyboardEvent):void {

jumpman_mc.play();

}

(This is taken from Colin Maxwell's Jumpman Flash game Jumpman - Adobe Flash games tutorial for beginners )

This is the whole code:

import flash.events.KeyboardEvent;

stop();

var health=20;

health_txt.text=health.toString();

var score=0;

score_txt.text=score.toString();

stage.addEventListener(Event.ENTER_FRAME, gameloop);

function gameloop(e:Event): void{

crate_mc.x-=20;

if  (crate_mc.x<-100) {

crate_mc.x=650;

score++;

score_txt.text=score.toString();

}

if (jumpman_mc.hitTestObject(crate_mc)) {

health--;

health_txt.text=health.toString();

if (health<=0) {

stage.removeEventListener(Event.ENTER_FRAME, gameloop);

stage.removeEventListener(KeyboardEvent.KEY_DOWN, jump);

gotoAndStop(1, "Scene 4");

}

}

}

stage.addEventListener(KeyboardEvent.KEY_DOWN, jump);

function jump(e:KeyboardEvent):void {

jumpman_mc.play();

}