Attempting to do the upgrade from 1.5.10 to 1.5.10a today. Third attempt. Process: 1. Turn off forum 2. Disable any addons 3. ftp files to server 4. goto install/ url. The page says "You are already running the current version (1.5.10)." acp does not show 1.5.10a version And I get server errors everytime after upload. Code: Fatal Error: Class 'Zend_Controller_Response_Http' not found 11 minutes ago - library/XenForo/FrontController.php:253 Delete... Fatal Error: Interface 'Zend_Cache_Backend_ExtendedInterface' not found 11 minutes ago - library/Zend/Cache/Backend/File.php:41 Delete... Fatal Error: syntax error, unexpected ''' (T_ENCAPSED_AND_WHITESPACE) 15 minutes ago - library/XenForo/Model/User.php:1164 Third attempt no cigar. Any idea's?