Install package via composer

composer require newelement/neutrino

When composer is finished run the install command:

php artisan neutrino:install

The install command will ask a couple questions. If you are installing a fresh install answer Y to the questions. You will also be asked to create an admin user.

After the installation is finished you can access the admin dashboard from the /admin route.

To use the default theme you will need Laravel UI and Bootstrap.

composer require laravel/ui
php artisan ui bootstrap

Now you can use npm to compile your assets