pagination not working

i used a script which replaced Next and Prev with pagination:

/*
* Add pagination with 1,2,3 numbers to the “Posts In Page” plugin.
*/
class ICPagePosts_Paginate_With_Numbers {

public function __construct( ) {
add_filter(‘posts_in_page_results’, array( &$this, ‘get_wp_query’ ));
add_filter(‘posts_in_page_paginate’, array( &$this, ‘paginate_links’ ));
}

public function get_wp_query($posts){
$this->posts = $posts;
return $posts;
}

public function paginate_links($html){
global $wp_query;
$posts = $this->posts;
$page_url = home_url( ‘/’ . $wp_query->post->post_name . ‘/’ );
$page = isset( $_GET[‘page’] ) ? $_GET[‘page’] : 1;
$total_pages = $posts->max_num_pages;
$per_page = $posts->query_vars[‘posts_per_page’];
$curr_page = ( isset( $posts->query_vars[‘paged’] ) && $posts->query_vars[‘paged’] > 0 ) ? $posts->query_vars[‘paged’] : 1;
$prev = ( $curr_page && $curr_page > 1 ) ? ‘<li class=”pag1″>Previous‘ : ”;
$next = ( $curr_page && $curr_page < $total_pages ) ? ‘<li class=”pag1″>Next‘ : ”;
$numbers = ”;
for ($i = 1; $i < $total_pages+1; $i++){
if ($i == $curr_page) {
$numbers .= ‘<li class=”pag1″>’ . $i . ‘‘;
} else {
$numbers .= ‘<li class=”pag1″>‘ . $i . ‘‘;
}
}
return ‘<ul class=”pag1″>’ . $prev . $numbers . $next . ‘‘;
}
}
new ICPagePosts_Paginate_With_Numbers();

This script stopped working at 1.3 i think. I can see why though. It makes a link in the old way you used to call the second page:
https://croatiagems.staging.wpengine.com/dubrovnik-villas/?page=2

I can see now it uses parent pages (Or maybe the client changed structure) but equally importantly it does not use the “?page=” syntax at the end anymore:
https://www.croatiagems.com/villas-apartments/villas-in-croatia/dubrovnik-villas/page/2/

Can you tell me how to change the above script to make pagination work with the latest 1.4.4 version? I have tried quite a few things and i can’t get it to work.

many thanks