Required permission: JIRA Administrators
Your version number can be found under the Manage Add-ons section of the JIRA Administration page. Click on the Gear Icon and select Add-ons. On the left-hand menu, click on Manage add-ons. Find your required Tempo product, such as Timesheets, and click on the arrow next to it. This will load your add-on details, where you can find your version number.