Minimum Requirements? "Compilation failed" error

Hi

I installed this plugin on my local server (using Desktop Server) and all works well. But when I install on my client’s server the results page changes. The permalink is displayed rather than the post title and I lose my menu. Initially I wondered whether it was an issue because I am using a Genesis Framework custom child theme but Query monitor gives a PHP issue of:
Compilation failed: support for \P, \p, and \X has not been compiled at offset 16 9 wp-content/plugins/search-everything/search-everything.php:834 preg_replace()

A php info on the client’s server reveals they are running version 5.3.3 and have version 6.6 of PCRE installed.

Do they need to update something?

Thanks.

https://www.ads-software.com/plugins/search-everything/