Commerce 2.x currently requires Drupal 8.5.0 or newer. Generally we require each minor release, as it contains improvements that we use, or to reduce our code base.
If you already have a web server, make sure it satisfies Drupal 8’s requirements. The recommended memory limit is 256MB or more.
Drupal Commerce requires that you have the bcmath extension installed.
If you are using Drupal VM, add the following to your configuration (change PHP version number if needed).
php_packages_extra: - php7.1-bcmath
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