Cake 3.4 beta install

I tryed

php composer.phar require "cakephp/cakephp:3.4.0-beta4"

php composer.phar didn’t work on windows, then I tryed

composer require "cakephp/cakephp:3.4.0-beta4"

It only did a partial install, vendor and some other folders, so how do I Install this and get all required folders?
webroot wasn’t even there.

Even read Although composer is the recommended installation method, there are pre-installed downloads available on Github. Followed link of https://github.com/cakephp/cakephp/tags downloaded, still not a complete folder structure.
Any ideas how to get the new beta on windows 10? the 3.3.* installed correctly.

For a new project, you need to run:

composer create cakephp/app:'3.next-dev'
composer require "cakephp/cakephp:3.4.0-beta4"

Will update an existing project to the 3.4 beta.

Thanks I will try that and yeah I prefer a new install.

I tryed

composer create cakephp/app:'3.next-dev'

but got this error:

[UnexpectedValueException]
Could not parse version constraint ‘3.next-dev’: Invalid version string “‘3.next-dev’”

I changed

to

composer create cakephp/app:3.next-dev

and it worked.

I always get confused as to when quotations are required or not.