[Uncaught ReferenceError: PixiPlugin is not defined]

I've used pixi plugin an put 

gsap.registerPlugin(PixiPlugin);

on top of js file. and it keeps telling that plugin is not defined.

How should I do?

 

        <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.9.1/gsap.min.js"></script>

        <script src='https://cdnjs.cloudflare.com/ajax/libs/pixi.js/4.5.5/pixi.min.js'></script>

        <script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/TweenMax.min.js'></script>

        <script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/plugins/PixiPlugin.min.js'></script>

        <script src="./script.js"></script>

 

 

[i'm having trouble knowing how to use downloaded plugins.]

Thanks  I used minified version and problem got fixed.

[i'm having trouble knowing how to use downloaded plugins.]

        <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.5.1/gsap.min.js"></script>

        <script src="./MorphSVGPlugin.js"></script>

 

I've paid for the membership, and downloaded the plugins, and put it on my project folder but its not working.

Can somebody help here? (I'm really really really a noob.)

 

btw, it worked remarkably well when code was like this

        <script src='https://assets.codepen.io/16327/MorphSVGPlugin3.min.js'></script>