It's not library/XenForo/Model/Option.php that's missing, it's library/XenForo/DataWriter/Option.php. Might as well do the whole upload again to make sure nothing else is missing.
It's not library/XenForo/Model/Option.php that's missing, it's library/XenForo/DataWriter/Option.php. Might as well do the whole upload again to make sure nothing else is missing.