.
Open a Command Prompt make a folder and open commmand prompt inside the folder
Copy Public Url and paste in your command prompt like below
composer install
Create a new .env file
cp .env.example .env
Now Create a App key
php artisan key:generate
Refresh cache
php artisan optimize:clear
make sure you connnect .your database in .env file if require and if there is some kind of table or migrations already define run
php artisan migrate
php artisan db:seed