Download it at http://wordpress.org/extend/plugins/support-tickets-v2/
The source Code is https://github.com/kezakez/Support-Tickets
Support Tickets is a WordPress plugin which allows you to create and manage a simple support ticket system or helpdesk system on your WordPress site. If you are offering a support service and are looking for a simple tool to help you with that, Support Tickets is an excellent choice.
This code has been forked with the permission of the original author Takayuki Miyoshi @takayukister
This fork contains bug fixes.
The original code can be found at http://wordpress.org/extend/plugins/support-tickets/
The plugin is based on Contact Form 7 plugin.
Please submit any issues on the wordpress plugin support page at http://wordpress.org/support/plugin/support-tickets-v2