Clone this repository. For example with:
git clone git@github.com:drupalnorge/drupalnorge-social.git
If you want a database dump, here is one: https://drupalnorge.no/sanitized.db
cd into the repository root. Install the composer dependencies. For example with:
composer install
Install drupal. You can do this however you want. One way is to use drush:
drush site-install --db-url=mysql://USER:PASS@HOST/DATABASE
Refer to this guide: https://www.drupal.org/docs/8/distributions/open-social/installing-and-updating