I requested a trial version of the bonfire plugin with my jira trial version, however nothing has been installed on my account.
It looks like you have signed up for a trial of Bonfire for a download/behind the firewall instance.
At https://my.atlassian.com you can select your OnDemand instance then click on "configure" and select Bonfire from this screen to have it added to your hosted instance.
Following that, you can download the plugin. Full details at the link below:
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