Run all of those commands:
composer install or php composer.phar install
mv .env.example .env
php artisan key:generate
php artisan migrate
php artisan db:seed to run seeders, if any.
php artisan serve
1. composer update --no-scripts or composer install
2. php artisan key:generate
3. rename example.env to .env
4. Change database credentials, set debug mode! Change app url
4. php artisan migrate(make sure u have the database running in the server)
5. php artisan config:clear
6. you are good to go!