You can download Drupal Commerce and add it to an existing Drupal 7 site or start a new site using a special installation profile. Drupal Commerce is fully open source: there is no "premium" version, meaning that you can take full advantage of the power of Drupal Commerce right now.
- Developers who like to handle Drupal installation from scratch or who want to extend an existing Drupal installation with Drupal Commerce features can download Drupal Commerce from its project page on drupal.org and install / configure the modules directly.
- New users and developers who want a readymade Drupal installation that includes Drupal Commerce with some basic configuration and example content should download Commerce Kickstart, the fastest way to get up and running with Drupal Commerce.
If you experience any issues with installation or configuration, be sure to search the Commerce Q&A and issue tracker to avoid posting duplicate questions or bug reports. Additionally, live help is often available from the community in our IRC room, #drupal-commerce on irc.freenode.net.