Balsmiq is a separate, commercial add-on not sold through Atlassian for Confluence OnDemand.
There is a free 30 days of the Balsamiq plugin but the start date is tied to the OnDemand evaluation start date. Your company have been using OnDemand for sometime now and are outside of the free day period. You can contact sales@balsamiq if you need additional time or to purchase a license.
If you're purchased a license and you are an Admin in Confluence you can check whether the plugin is enabled or disabled by reviewing this document.
I hope this helps.
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