Plugin Has been disabled for security reasons

Web hosting companies do this to prevent you from running very-long-running processes that could impact the availability of other websites sharing the server. It means that set_time_limit is disabled in your php.ini’. Try removing set_time_limit from the plugin.

Here you will find the MaxExecutionTime
https://github.com/inpsyde/search-and-replace/blob/master/inc/Plugin.php#L25-L26