diff --git a/api/v2/get/software_available.php b/api/v2/get/software_available.php
index ca139d1..61cad75 100644
--- a/api/v2/get/software_available.php
+++ b/api/v2/get/software_available.php
@@ -238,6 +238,7 @@ if (isset($criterias['sn']) && $criterias['sn'] != ''){
             $available_upgrades = 0;
             $has_priced_options = false;
             $has_latest_version_different = false;
+            $version_details = []; // Track version details for downgrade prevention
 
             if (debug) {
                 $debug['version_checks'] = [];
@@ -319,7 +320,7 @@ if (isset($criterias['sn']) && $criterias['sn'] != ''){
 
                 if ($show_version) {
                     $available_upgrades++;
-                    
+
                     //Check if there's a valid license for this upgrade
                     if ($final_price > 0 && $sw_version_license) {
                         //Check if the license is valid
@@ -342,6 +343,12 @@ if (isset($criterias['sn']) && $criterias['sn'] != ''){
                         }
                     }
 
+                    // Store version details for downgrade prevention check (after license application)
+                    $version_details[] = [
+                        'show_version' => true,
+                        'final_price' => $final_price
+                    ];
+
                     // Check for priced options
                     if ($final_price > 0) {
                         $has_priced_options = true;
@@ -364,6 +371,48 @@ if (isset($criterias['sn']) && $criterias['sn'] != ''){
                 }
             }
 
+            //PREVENT DOWNGRADE FROM PAID VERSION TO FREE VERSION (if config enabled)
+            if (defined('PREVENT_PAID_VERSION_DOWNGRADE') && PREVENT_PAID_VERSION_DOWNGRADE && $current_sw_version) {
+                // Check if user is currently on a paid version (check if there was a paid upgrade path TO current version)
+                $sql = 'SELECT COUNT(*) as paid_to_current
+                        FROM products_software_upgrade_paths pup
+                        JOIN products_software_versions to_ver ON pup.to_version_id = to_ver.rowID
+                        WHERE LOWER(TRIM(LEADING "0" FROM to_ver.version)) = ?
+                            AND pup.price > 0
+                            AND pup.is_active = 1';
+                $stmt = $pdo->prepare($sql);
+                $stmt->execute([$current_sw_version]);
+                $paid_check = $stmt->fetch(PDO::FETCH_ASSOC);
+                $is_current_paid_version = ($paid_check['paid_to_current'] > 0);
+
+                if (debug) {
+                    $debug['downgrade_prevention'] = [
+                        'enabled' => true,
+                        'current_version' => $current_sw_version,
+                        'is_current_paid_version' => $is_current_paid_version
+                    ];
+                }
+
+                // If current version is paid, recalculate available_upgrades excluding free versions
+                if ($is_current_paid_version) {
+                    $available_upgrades_before = $available_upgrades;
+                    $available_upgrades = 0;
+
+                    // Recount only paid upgrades (exclude free versions)
+                    foreach ($version_details as $detail) {
+                        if ($detail['show_version'] && floatval($detail['final_price']) > 0) {
+                            $available_upgrades++;
+                        }
+                    }
+
+                    if (debug) {
+                        $debug['downgrade_prevention']['available_upgrades_before'] = $available_upgrades_before;
+                        $debug['downgrade_prevention']['available_upgrades_after'] = $available_upgrades;
+                        $debug['downgrade_prevention']['message'] = 'Excluded free versions to prevent downgrade from paid version';
+                    }
+                }
+            }
+
             // Simple logic: if any upgrades are available to show, return "yes"
             if ($available_upgrades > 0) {
                 $software_available = "yes";
diff --git a/api/v2/get/software_update.php b/api/v2/get/software_update.php
index a7191c3..782aceb 100644
--- a/api/v2/get/software_update.php
+++ b/api/v2/get/software_update.php
@@ -441,6 +441,46 @@ if (isset($criterias['sn']) && $criterias['sn'] != ''){
                 }
             }
 
+            //PREVENT DOWNGRADE FROM PAID VERSION TO FREE VERSION (if config enabled)
+            if (defined('PREVENT_PAID_VERSION_DOWNGRADE') && PREVENT_PAID_VERSION_DOWNGRADE && $current_sw_version) {
+                // Check if user is currently on a paid version (check if there was a paid upgrade path TO current version)
+                $sql = 'SELECT COUNT(*) as paid_to_current
+                        FROM products_software_upgrade_paths pup
+                        JOIN products_software_versions to_ver ON pup.to_version_id = to_ver.rowID
+                        WHERE LOWER(TRIM(LEADING "0" FROM to_ver.version)) = ?
+                            AND pup.price > 0
+                            AND pup.is_active = 1';
+                $stmt = $pdo->prepare($sql);
+                $stmt->execute([$current_sw_version]);
+                $paid_check = $stmt->fetch(PDO::FETCH_ASSOC);
+                $is_current_paid_version = ($paid_check['paid_to_current'] > 0);
+
+                if (debug) {
+                    $debug['downgrade_prevention'] = [
+                        'enabled' => true,
+                        'current_version' => $current_sw_version,
+                        'is_current_paid_version' => $is_current_paid_version
+                    ];
+                }
+
+                // If current version is paid, remove all free versions from the output (except current)
+                if ($is_current_paid_version) {
+                    $output = array_filter($output, function($option) {
+                        $price = floatval($option['price']);
+                        $is_current = $option['is_current'];
+                        // Keep if it's the current version OR if it's a paid version
+                        return $is_current || $price > 0;
+                    });
+                    // Re-index array after filtering
+                    $output = array_values($output);
+
+                    if (debug) {
+                        $debug['downgrade_prevention']['filtered_count'] = count($output);
+                        $debug['downgrade_prevention']['message'] = 'Removed free versions to prevent downgrade from paid version';
+                    }
+                }
+            }
+
             //GENERATE DOWNLOAD TOKENS FOR EACH OPTION
             foreach ($output as &$option) {
                 // Generate time-based download token
diff --git a/assets/database/STEP3.txt b/assets/database/STEP3.txt
index 5c36726..0a71829 100644
--- a/assets/database/STEP3.txt
+++ b/assets/database/STEP3.txt
@@ -3,6 +3,7 @@ define("WARRANTY_MONTHS", 12);
 define("WARRANTY_ELIGIBILITY_WINDOW", 3);
 define("WARRANTY_EXTENDED_MONTH", 24);
 define("SERVICE_MONTHS", 12);
+define('PREVENT_PAID_VERSION_DOWNGRADE',false);
 
 // Enable automatice invoice forward to bookkeeping software
 define('invoice_bookkeeping',false);
diff --git a/assets/images/TSS_invoice_footer.png b/assets/images/TSS_invoice_footer.png
index c6129f5..8860ba5 100644
Binary files a/assets/images/TSS_invoice_footer.png and b/assets/images/TSS_invoice_footer.png differ
diff --git a/assets/images/TSS_invoice_header.png b/assets/images/TSS_invoice_header.png
index aa6ef31..1e8b08e 100644
Binary files a/assets/images/TSS_invoice_header.png and b/assets/images/TSS_invoice_header.png differ
diff --git a/assets/mail/email_template_invoice.php b/assets/mail/email_template_invoice.php
index 429edea..4b1a2b8 100644
--- a/assets/mail/email_template_invoice.php
+++ b/assets/mail/email_template_invoice.php
@@ -23,24 +23,6 @@ $message = '
                             <h1 style="font-size: 24px; font-weight: bold; color: #2c5f5d; margin: 0 0 25px 0;">' . htmlspecialchars($lbl_invoice) . '</h1>
                             
                             <!-- Company Header -->
-                            <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="100%" style="margin-bottom: 25px;">
-                                <tr>
-                                    <td width="50%" style="vertical-align: top; font-size: 13px; line-height: 1.5;">
-                                        <strong style="color: #2c5f5d; font-size: 14px;">Total Safety Solutions B.V.</strong><br>
-                                        Laarakkerweg 8<br>
-                                        5061 JR OISTERWIJK<br>
-                                        Nederland
-                                    </td>
-                                    <td width="50%" style="vertical-align: top; text-align: left;">
-                                        <strong style="color: #2c5f5d; font-size: 14px;">contact-details</strong><br>
-                                        Ralf Adams<br>
-                                        +31 13 8221480<br>
-                                        ralfadams@totalsafetysolutions.nl
-                                    </td>
-                                </tr>
-                            </table>
-
-                            <!-- Customer -->
                             <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="100%" style="margin-bottom: 25px;">
                                 <tr>
                                     <td width="50%" style="vertical-align: top; font-size: 13px; line-height: 1.5;">
@@ -50,7 +32,10 @@ $message = '
                                         '.$invoice_data['customer']['zip'].', '.$invoice_data['customer']['city'].'<br>
                                         '.$invoice_data['customer']['country'].'
                                     </td>
-                                   
+                                    <td width="50%" style="vertical-align: top; text-align: left;">
+                                        <strong style="color: #2c5f5d; font-size: 14px;">contact-details</strong><br>
+                                        sales@totalsafetysolutions.nl
+                                    </td>
                                 </tr>
                             </table>
                             
diff --git a/assets/mail/pdf_template_invoice.php b/assets/mail/pdf_template_invoice.php
index 33a8a1b..afad03f 100644
--- a/assets/mail/pdf_template_invoice.php
+++ b/assets/mail/pdf_template_invoice.php
@@ -211,28 +211,17 @@ $pdf = '<!DOCTYPE html>
     <div class="invoice-title">' . htmlspecialchars($lbl_invoice) . '</div>
 
     <div class="company-header">
-        <div class="company-info">
-            <h3>Total Safety Solutions B.V.</h3>
-            <p>Laarakkerweg 8</p>
-            <p>5061 JR OISTERWIJK</p>
-            <p>Nederland</p>
-        </div>
-        <div class="contact-details">
-            <h3>contact-details</h3>
-            <p>Ralf Adams</p>
-            <p>+31 13 8221480</p>
-            <p>ralfadams@totalsafetysolutions.nl</p>
-        </div>
-    </div>
-
-     <div class="company-header">
-        <div class="company-info">
+         <div class="company-info">
             <h3>Customer</h3>
             <p>'.$invoice_data['customer']['name'].'</p>
             <p>'.$invoice_data['customer']['street'].'</p>
             <p>'.$invoice_data['customer']['zip'].', '.$invoice_data['customer']['city'].'</p>
             <p>'.$invoice_data['customer']['country'].'</p>
         </div>
+        <div class="contact-details">
+            <h3>contact-details</h3>
+            <p>sales@totalsafetysolutions.nl</p>
+        </div>
     </div>
 
     <div class="invoice-details">