The fastest and simplest way of installing Laravel is via composer command. From the laravel docs (http://laravel.com/docs/quick), it shows that we can install it with this:
Installing specific laravel version with composer create-project
composer global require laravel/installer
Then, if you want install specific version then just edit version values "6." , "5.8."
composer create-project --prefer-dist laravel/laravel Projectname "6.*"
Run Local Development Server
php artisan serve