Thank you for your reply.
sorry for disturbing you please check below link:
it says "Restriction: You cannot install new add-ons nor remove existing add-ons as per the Atlassian OnDemand Add-on (Plugins) Policy."
please explain me. if im JIRA OnDemand user am i can get gantt project add-on to my JIRA.
You can install only add-ons available for ondemand. Here are two gantt related for ondemand
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