Let's begin with the basics - installing laravel's current version:

composer create-project --prefer-dist laravel/laravel <project name>

To install a particular version of Laravel, simply add the version number after the project's name, like the following:

composer create-project laravel/laravel <project name> "5.3.*" --prefer-dist

Obviously, <project name> is the name of your project, and the entire application will be put into this directory.