If you do not have Composer, you may install it by following the instructions at getcomposer.org.
You can then install this demo using the following command:
$ cd /path/to/web/root
$ php composer.phar global require "fxp/composer-asset-plugin:~1.0.0"
$ php composer.phar create-project --prefer-dist --stability=dev janisto/yii2-ycm-demo yii2-ycm-demo
Create database yii2-ycm-demo
Edit config/db.php if needed
Run migrations:
$ php yii migrate/up --interactive=0
Now you should be able to access the demo through the following URL, assuming yii2-ycm-demo is the directory
directly under the Web root.
http://localhost/yii2-ycm-demo/web/admin