he current stable version of CiviCRM is 4.3. CiviCRM distributions are freely available for download from our SourceForge project download pages. You will need to know which host Content Management software (CMS) and which version you are using. CiviCRM 4.3 is compatible with Drupal version 7.x, Joomla! version 1.7.x / 2.5.x, and WordPress version 3.4.x. There is a separate download for Drupal version 6.x which is not officially supported.

EXAMPLE : civicrm-4.3.0-drupal.tar.gz This file is version 4.3.0 for Drupal 7.
EXAMPLE : civicrm-4.3.0-drupal6.tar.gz This file is version 4.3.0 for Drupal 6 (community supported).
EXAMPLE : civicrm-4.3.0-joomla.zip This file is version 4.3.0 for Joomla! 1.7 / 2.5.
EXAMPLE : civicrm-4.3.0-wordpress.zip This file is version 4.3.0 for WordPress.

Download CiviCRM from SourceForge

CiviCRM 4.3 requires PHP5.3.x and MySQL 5.1.x

Check out the CiviCRM Installation Guide for more information.  

If you want to run CiviCRM in a language other than U.S. English, you will also need to download the corresponding translations file (civicrm....l10n.tar.gz).   EXAMPLE : civicrm-4.3.0-l10n.tar.gz This file has all currently available translations for version 4.3. The same translation file is used for Drupal, Joomla and Wordpress. Check out the Localisation Guide for info on how translations work, and theonline translators community to learn about and participate in translation teams. If you have questions about translation/localisation, please post them to our Internationalization and Localization Forum.

source civicrm.org