XF 1.4 MySQL Errors During Add-On Install

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I've been trying to install [KL] Fonts Manager and I run into an error every time. Can someone explain how to fix this? Preferably in simple terms for someone who is a total moron re: MySQL. ;) Thanks!

Mysqli statement execute error : Duplicate column name 'additional_data'

  1. Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 297
  2. Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479
  3. Zend_Db_Adapter_Abstract->query() in KL/Install.php at line 111
  4. KL_Install::_processData() in KL/Install.php at line 152
  5. KL_Install::install()
  6. call_user_func() in XenForo/Model/AddOn.php at line 215
  7. XenForo_Model_AddOn->installAddOnXml() in XenForo/Model/AddOn.php at line 169
  8. XenForo_Model_AddOn->installAddOnXmlFromFile() in XenForo/ControllerAdmin/AddOn.php at line 187
  9. XenForo_ControllerAdmin_AddOn->actionInstall() in XenForo/FrontController.php at line 347
  10. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
  11. XenForo_FrontController->run() in /var/www/thestarwarsrp.com/public_html/forum/admin.php at line 13
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