At the moment of writing the latest version of the plugin is 4.6.4 had been released.
In case you have missed updating to latest version, here are the details as published by iTheme Security. Latest updates for version 4.6.2 to 4.6.4 are listed below.
4.6.4
Fixes to .htaccess file modifications now function as expected when changing settings.
4.6.3
Fixes to Fixed warnings produced when saving settings that update the wp-config.php file
4.6.2
Added New Feature: Change WordPress Salts
Added New Enhancement: Refactored ITSEC_Lib and ITSEC_Files for better usability and new functions to make changing salts possible
If you want to read more about plugin, you can read my review of the ithemes security plugin.