If you want to use the latest version from github, please follow these steps to get everything up and running.
Create a file called composer.json and put the following content in it:
2. Install all composer dependencies by running composer install
Start a webserver to serve the public directory. You can also use the built-in PHP webserver, switch into the public directory cd public and start the webserver using this command: php -S localhost:8000 index.php
Open your webserver and navigate to whatever address you are using, for example http://localhost:8000.
Follow the setup wizard.