You can install it going to Administration > Add-ons and upload this ifle or you can find this plugin going to "find Add-ons".
This documentation explains how to install any third-party plugin:
Since it is a workflow, you can basically add it the way Nic explained.
If you need a complete ready-to-use workflow suite for your IT Service Desk, Valiantys has just released a powerful ITIL-based bundle that covers Incident, Problem and Change.
Why don't you give it a try? It's free.
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