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Download the zip folder and unzip, upload to your sngine root following the file structure.

Sngine files that you will need to overwrite

root/manifest.php
root/sw.js

content/themes/default/templates/admin.pwa.tpl
content/themes/default/templates/manifest.tpl

Visit your phpmyadmin and import the database db.sql located inside modules/pwa/db.sql 

Once all files are uploaded, you will need to edit a few files 

open 

content/themes/default/templates/_head.tpl

Look for

    
    {if $system['pwa_enabled']}
      
      
      
      
    {else}
      
      
      
    {/if}
    

and replace with 

{if $system['pwa_enabled']}
 {include file='pwa/pwa-head-tags.tpl'}
    {/if}

Open root/admin.php

Look for 

case 'pwa':

After that add 

require('modules/pwa/admin.php');

Open includes/ajax/admin/settings.php

and look for 

case 'pwa':

Replace that entire case with 

case 'pwa':
  // Check if it's a POST request for saving
  if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Include the handler
    $handler_path = __DIR__ . '/../../../modules/pwa/pwa_admin_handler.php';
    
    if (file_exists($handler_path)) {
      require_once($handler_path);
      exit;
    } else {
      return_json(['error' => true, 'message' => 'Handler file not found']);
    }
  }
  
  // GET request - Load data and render page
  
  // Load categories from database
  $get_categories = $db->query("SELECT * FROM pwa_categories ORDER BY category_id ASC");
  $pwa_categories = [];
  if ($get_categories && $get_categories->num_rows > 0) {
    while ($category = $get_categories->fetch_assoc()) {
      $pwa_categories[] = $category;
    }
  }
  
  // Load related apps from database
  $get_apps = $db->query("SELECT * FROM pwa_related_apps ORDER BY app_id ASC");
  $pwa_related_apps = [];
  if ($get_apps && $get_apps->num_rows > 0) {
    while ($app = $get_apps->fetch_assoc()) {
      $pwa_related_apps[] = $app;
    }
  }
  
  // Load shortcuts from database
  $get_shortcuts = $db->query("SELECT * FROM pwa_shortcuts ORDER BY `order` ASC");
  $pwa_shortcuts = [];
  if ($get_shortcuts && $get_shortcuts->num_rows > 0) {
    while ($shortcut = $get_shortcuts->fetch_assoc()) {
      $pwa_shortcuts[] = $shortcut;
    }
  }
  
  // Load analytics stats
  $pwa_stats = [
    'total_installs' => 0,
    'this_month' => 0,
    'this_week' => 0,
    'today' => 0
  ];
  
  $get_total = $db->query("SELECT COUNT(*) as count FROM pwa_analytics WHERE event_type = 'install'");
  if ($get_total) {
    $pwa_stats['total_installs'] = $get_total->fetch_assoc()['count'];
  }
  
  $get_month = $db->query("SELECT COUNT(*) as count FROM pwa_analytics 
                          WHERE event_type = 'install' 
                          AND created_at >= DATE_SUB(NOW(), INTERVAL 1 MONTH)");
  if ($get_month) {
    $pwa_stats['this_month'] = $get_month->fetch_assoc()['count'];
  }
  
  $get_week = $db->query("SELECT COUNT(*) as count FROM pwa_analytics 
                         WHERE event_type = 'install' 
                         AND created_at >= DATE_SUB(NOW(), INTERVAL 1 WEEK)");
  if ($get_week) {
    $pwa_stats['this_week'] = $get_week->fetch_assoc()['count'];
  }
  
  $get_today = $db->query("SELECT COUNT(*) as count FROM pwa_analytics 
                          WHERE event_type = 'install' 
                          AND DATE(created_at) = CURDATE()");
  if ($get_today) {
    $pwa_stats['today'] = $get_today->fetch_assoc()['count'];
  }
  
  // Recent activity
  $get_recent = $db->query("SELECT * FROM pwa_analytics 
                           ORDER BY created_at DESC 
                           LIMIT 20");
  $pwa_recent_activity = [];
  if ($get_recent && $get_recent->num_rows > 0) {
    while ($activity = $get_recent->fetch_assoc()) {
      $pwa_recent_activity[] = $activity;
    }
  }
  
  // Assign to Smarty
  $smarty->assign('pwa_categories', $pwa_categories);
  $smarty->assign('pwa_related_apps', $pwa_related_apps);
  $smarty->assign('pwa_shortcuts', $pwa_shortcuts);
  $smarty->assign('pwa_stats', $pwa_stats);
  $smarty->assign('pwa_recent_activity', $pwa_recent_activity);
  
  // Set active tab if provided
  $smarty->assign('active_tab', $_GET['tab'] ?? 'general');
 break;

Now go to sngine default pwa settings in admincp/pwa

setup you images, you don't need to worry about resizing the icons images because it will be resized on upload. 

If you got stuck and need help, open a thread here