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Disabling JExcel Free
Log in as a user with the JIRA Administrators global permission.
Choose the 
Image Addedicon at top right of the screen, then choose add-ons, select Manage add-ons (left tabs).
Image AddedTip: Use its Keyboard Shortcut instead: g then g and start typing manage... .
Expand JExcel in the User-installed Add-ons.
Click the Disable button.
Image Added See further information for JIRA documentation on Disabling and Enabling add-ons.
Uninstalling JExcel Free
Log in as a user with the JIRA Administrators global permission.
Choose the 
Image Addedicon at top right of the screen, then choose add-ons, select Manage add-ons (left tabs).
Image AddedTip: Use Keyboard Shortcut instead: g then g and start typing manage... .
Expand JExcel in the User-installed Add-ons.
Click the Uninstall button.