There are multiple ways to install Laravel. One of the simplest ways would be to install through composer with the command: composer create-project --prefer-dist laravel/laravel MyAppName
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All of the documentation for installing laravel 5.4 can be found here: https://laravel.com/docs/5.4/installation
The new features are covered on laracasts and on the docs. Here is a link to some of the new features: https://laracasts.com/series/whats-new-in-laravel-5-4
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solved How to install Laravel 5.4?