install phaser

i think you mean for Node.JS if yes here you are

npm install phaser --save

also tehre you see npm command but use --save flag to save it to your package.json file :)

https://www.npmjs.com/package/phaser

also if npm no work try

npm -v

this is for update npm by the way

npm i -g npm

if no works download Node.JS :) and install it

My guess is that you are running this on the front-end. If this is the case, you will want to move the phaser.js file to your project (into the js or javascript folder if you have one), then add it to your project with a script tag in your HTML:

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

Or you could just use the CDN (but you need internet access to when developing your website):

<script src="https://cdnjs.cloudflare.com/ajax/libs/phaser/2.6.2/phaser.js"></script>

Hope this helps!

These are all great ideas, for me personally, when I really am stuck on something I go to the docs I don't know phaser, but reading the docs should be your first go to for help, if the docs are not written well, I'd say find something else.