Hi,
You had a very old release installed, I recommend updating a bit more often to maintain the codebase, however this issue would still exist.
There were a few changes in the recent releases, namely the plugin is compiled to native javascript and no longer required jQuery, and some event handlers act a bit differently.
I see there are changes on the results template, I think there is a way to resolve this very easily by adding two additional class names to the template files. I assume you have the custom istopic.php results template in your theme directory, so please open that, and make the following change: https://i.imgur.com/zhXYhrM.png
By adding these two missing classes the event handler will recognize the href attribute and trigger the correct redireciton.
PHP 8.3 will work fine on the recent version, we are currently using that PHP version on the demo site.