Only members of the Site-Admin Group can add Paid Add-ons or Applications to the instance
Steps
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Click on the Settings icon and select Jira Settings > Apps
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Search for Three Dimensional Date Gadgets and click on the result to view the details
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Click on Try it free button
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Click on Start free trial button to proceed with the installation
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A popup will appear to inform you the installation is in progress
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The popup message will appear in the top right to confirm the app has been successfully added
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The trial license will be applied automatically. You can start using the app now.