How to install package in existing or specific folder?
This command will install to current folder
composer create-project laravel/laravel .
This composer command will install in specific folder:
composer create-project laravel/laravel folder_name
To install specific version of package in specific folder:
composer create-project laravel/laravel folder_name 5.2.* // will install only laravel version 5.2 and greater
If you do not have installed composer, here is short tutor how to install composer on Mac OS