The Omega 4.x base theme comes with built-in Drush integration to extend the core commands of Drush itself for various Omega 4.x and theming related tasks.
The following guide assumes that you already have Drush installed and running.
In previous versions, the Omega theme Drush integration was provided by a module (Omega Tools). However, the maintainers of Drush recently added command discovery for themes which now allows us to ship the Drush integration directly with the Omega theme instead of maintaining a separate module. Omega Tools has consequently been deprecated and will no longer be maintained for the 4.x version of Omega.
Please do not install Omega Tools when running Omega 4.x. It might overlap/collide with the Drush integration provided by the theme.
Once you have Drush installed and working you can download Omega 4.x by navigating into your Drupal directory and issues the following command.
drush dl omega
This will automatically download and place Omega 4.x in
Drush has an internal cache that you may have to clear in order to make use of the Omega related commands. The following command clears the internal Drush cache.