If you are upgrading from a previous installation. Replace your folder with the files. Deactivate then  reactivate the plugin to populate the new available options in the database. Previous settings won't be deleted.

  1. Just like any WordPress plugin, unzip the plugin folder an copy paste it in your wp-content/plugins folder.
  2. As an administrator, activate the plugin in the plugin management of your WordPress
  3. You now have a new entry in the WooCommerce menu “Sponsor a friend” where you can edit settings.