how we can upgrade the vicidial

Hi
we currently running a VICIDIAL web-client version: 2.0.129, we want to upgrade into VERSION 2.0.4 coz of its new feature and added some dispostion.
How can we start upgrading? what are we supposed to do?
we currently running a VICIDIAL web-client version: 2.0.129, we want to upgrade into VERSION 2.0.4 coz of its new feature and added some dispostion.
How can we start upgrading? what are we supposed to do?