seller, seeing the product of another vendor, how to prevent it? 3

Hello my friend
I returned my backup, and remains the same (sellers continue to see products from other vendors)
see if this correct my code (class-install.php)

[ Moderator note: Code fixed, please wrap code in backticks or use the code button. ]

<?php
/**
 * Install class on activation.
 *
 * @author  Matt Gates <https://mgates.me>
 * @package ProductVendor
 */

class WCV_Install
{

 /**
  * Checks if install is requierd
  *
  * @return unknown
  */
 public function init()
 {
  $db_version = WC_Vendors::$pv_options->get_option( 'db_version' );

  // Initial Install
  if ( version_compare( $db_version, '1.0', '<' ) ) {
   $this->install_wcvendor();
   WC_Vendors::$pv_options->update_option( 'db_version', '1.5.0' );
  }

 }

 /**
  * Grouped functions for installing the WC Vendor plugin
  */
 private function install_wcvendor()
 {
  // Clear the cron
  wp_clear_scheduled_hook( 'pv_schedule_mass_payments' );

  // Add the vendors role
  $this->add_new_roles();

  // Create tables
  $this->create_new_tables();

  // Create the Orders page if it doesn't exist
  $orders_page = WC_Vendors::$pv_options->get_option( 'orders_page' );
  if ( empty( $orders_page ) ) $this->create_new_pages();
 }

 /**
  * Add the new Vendor role
  *
  * @return bool
  */
 private function add_new_roles()
 {
  remove_role( 'pending_vendor' );
  add_role( 'pending_vendor', __( 'Pending Vendor', 'wcvendors' ), array(
                       'read'         => true,
                       'edit_posts'   => false,
                       'delete_posts' => false
                     ) );

  remove_role( 'vendor' );
  add_role( 'vendor', 'Vendor', array(
             'assign_product_terms'     => true,
             'edit_products'            => true,
             'edit_published_products'  => false,
             'manage_product'           => true,
             'publish_products'         => false,
             'read'                     => true,
             'upload_files'             => true,
             'view_woocommerce_reports' => true,
           ) );
 }

 /**
  * Create the pv_commission table
  */
 private function create_new_tables()
 {
  global $wpdb;

  $table_name = $wpdb->prefix . "pv_commission";
  require_once ABSPATH . 'wp-admin/includes/upgrade.php';

  $sql = "CREATE TABLE $table_name (
   id bigint(20) NOT NULL AUTO_INCREMENT,
   product_id bigint(20) NOT NULL,
   order_id bigint(20) NOT NULL,
   vendor_id bigint(20) NOT NULL,
   total_due decimal(20,2) NOT NULL,
   qty BIGINT( 20 ) NOT NULL,
   total_shipping decimal(20,2) NOT NULL,
   tax decimal(20,2) NOT NULL,
   status varchar(20) NOT NULL DEFAULT 'due',
   time datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
   UNIQUE KEY id (id)
  );";
  dbDelta( $sql );
 }

 /**
  * Create a page
  *
  * @access public
  * @return void
  *
  * @param mixed  $slug         Slug for the new page
  * @param mixed  $option       Option name to store the page's ID
  * @param string $page_title   (optional) (default: '') Title for the new page
  * @param string $page_content (optional) (default: '') Content for the new page
  * @param int    $post_parent  (optional) (default: 0) Parent for the new page
  */
 function create_page( $slug, $page_title = '', $page_content = '', $post_parent = 0 )
 {
  global $wpdb;

  $page_id = WC_Vendors::$pv_options->get_option( $slug . '_page' );

  if ( $page_id > 0 && get_post( $page_id ) ) {
   return $page_id;
  }

  $page_found = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM " . $wpdb->posts . " WHERE post_name = %s LIMIT 1;", $slug ) );
  if ( $page_found ) {
   if ( !$page_id ) {
    WC_Vendors::$pv_options->update_option( $slug . '_page', $page_found );

    return $page_found;
   }

   return $page_id;
  }

  $page_data = array(
   'post_status'    => 'publish',
   'post_type'      => 'page',
   'post_author'    => 1,
   'post_name'      => $slug,
   'post_title'     => $page_title,
   'post_content'   => $page_content,
   'post_parent'    => $post_parent,
   'comment_status' => 'closed'
  );

  $page_id = wp_insert_post( $page_data );
  WC_Vendors::$pv_options->update_option( $slug . '_page', $page_id );

  return $page_id;
 }

 /**
  * Create the Orders page for the frontend
  */
 private function create_new_pages()
 {
  global $wpdb;

  $vendor_page_id = $this->create_page( 'vendor_dashboard', __( 'Vendor Dashboard', 'wcvendors' ), '[wcv_vendor_dashboard]' );
  $this->create_page( 'orders', __( 'Orders', 'wcvendors' ), '[wcv_orders]', $vendor_page_id );
  $this->create_page( 'shop_settings', __( 'Shop Settings', 'wcvendors' ), '[wcv_shop_settings]', $vendor_page_id );
 }

 /**
  * Depreciated
  *
  * @param unknown $version
  */
 public function update_to( $version )
 {
  global $wpdb;

  $table_name = $wpdb->prefix . "pv_commission";

  switch ( $version ) {

   case '1.3.2':

    $sql = "ALTER TABLE  <code>{$table_name}</code> ADD  <code>qty</code> BIGINT( 20 ) NOT NULL AFTER  <code>total_due</code>";
    $wpdb->query( $sql );

    $sql     = "SELECT * FROM <code>{$table_name}</code>";
    $results = $wpdb->get_results( $sql );
    foreach ( $results as $key => $value ) {

     $order = new WC_Order( $value->order_id );

     foreach ( $order->get_items() as $o_key => $o_value ) {

      if ( $value->product_id == $o_value[ 'product_id' ] || ( !empty( $o_value[ 'variation_id' ] ) && $value->product_id == $o_value[ 'variation_id' ] ) ) {
       $wpdb->update(
        $table_name,
        array( 'qty' => $o_value[ 'qty' ] ),
        array( 'id' => $value->id ),
        array( '%d' ),
        array( '%d' )
       );
      }
     }

    }

    break;

   case '1.4.0':

    add_role( 'pending_vendor', __( 'Pending Vendor', 'wcvendors' ), array(
                         'read'         => true,
                         'edit_posts'   => false,
                         'delete_posts' => false
                       ) );

    $this->create_new_pages();

    break;

   case '1.4.2':

    $sql = "ALTER TABLE  <code>{$table_name}</code> ADD  <code>total_shipping</code> decimal(20,2) NOT NULL AFTER <code>total_due</code>";
    $wpdb->query( $sql );

   case '1.4.3':

    $sql = "ALTER TABLE  <code>{$table_name}</code> ADD  <code>tax</code> decimal(20,2) NOT NULL AFTER <code>total_shipping</code>";
    $wpdb->query( $sql );

   case '1.4.5':

    // Flush rules to fix the /page/2/ issue on vendor shop pages
    update_option( WC_Vendors::$id . '_flush_rules', true );

   default:
    // code...
    break;
  }
 }

}

https://www.ads-software.com/plugins/wc-vendors/