Gantt Suite for Jira v 2.0.x: Gantt: Installation
Installation is as simple as: Go to Administration -> Apps -> Find new apps. Type 'gantt suite for jira', find the Gantt Suite for Jira plugin and install it. Gantt Suite for Jira v 2.0.x: Gantt Suite Overview describes how and where you can access Gantt Suite for Jira.