REQUIREMENTS:
In order to enjoy full potential of role_expire module you need to properly configure Cron job on your server (http://drupal.org/cron) or install poormanscron.module (http://drupal.org/project/poormanscron).

INSTALLATION PROCEDURE:
1. Extract the module directory (and files) from tarball.
2. Move role_expire directory to your Drupal's /sites/modules folder (You might need to create modules directory if your installation is fresh).
3. Login to your Drupal site as superuser.
4. Go to Administer -> Site building -> Modules.
5. Enable role_expire module.
6. Save configuration.
7. Enjoy!