functions.php

<?php

if ( function_exists( 'YITH_WC_Subscription_Frontend' ) ) {
    add_filter( 'woocommerce_customer_get_downloadable_products', 'woocommerce_order_get_downloadable_items_ywsbs_helper' );
    function woocommerce_order_get_downloadable_items_ywsbs_helper( $downloads ) {

        if ( ! is_account_page() ) {
            return $downloads;
        }

        $used = array();
        $singles = array();

        foreach ( $downloads AS $key => $line ) { 
                if ( !in_array($line['download_id'], $used) ) {     
                    $used[] = $line['download_id']; 
                    $singles[] = $line; 
                } 
        } 

        return $singles;
    }
}