See this extract from the licensing and purchasing faq (https://www.atlassian.com/licensing/purchase-licensing):
Screen Shot 2016-10-07 at 10.54.50.png
To extend your trial, got to you My Atlassian account first. If you need further assistance, you can also contact Purchasing and Licensing Support here: https://www.atlassian.com/company/contact/purchasing-licensing
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