diff --git a/public/license-required.php b/public/license-required.php
index 7933ae6..52b3bd3 100644
--- a/public/license-required.php
+++ b/public/license-required.php
@@ -46,6 +46,23 @@ if (strtolower($_SERVER['REQUEST_METHOD']) == 'post' && isset($_FILES['upload-li
 }
 /* END UPLOAD PROCESSING */
 
+/* START LICENSE ERROR */
+$licenseError = null;
+if (isset($_GET['licerror']))
+{
+    $licenseErrorNumber = intval($_GET['licerror']);
+
+    if (isset($lang['license_errors'][$licenseErrorNumber]))
+    {
+        $licenseError = $lang['license_errors'][$licenseErrorNumber];
+    }
+    else
+    {
+        $licenseError = $lang['license_errors'][99];
+    }
+}
+/* END LICENSE ERROR */
+
 ob_start();
 ?>
 
@@ -59,6 +76,11 @@ ob_start();
         <p><?php echo $uploadError; ?></p>
     </div>
 <?php endif; ?>
+<?php if (!is_null($licenseError)): ?>
+    <div class="alert alert-danger">
+        <p><?php echo $licenseError; ?></p>
+    </div>
+<?php endif; ?>
 <form action="license-required.php" method="post" enctype="multipart/form-data">
     <div class="form-group">
         <label class="control-label"><?php echo $lang['upload_license_label']; ?></label>
diff --git a/public/raw/lang.en.php b/public/raw/lang.en.php
index 3f7dca3..2cf01ad 100644
--- a/public/raw/lang.en.php
+++ b/public/raw/lang.en.php
@@ -2,6 +2,17 @@
 return [
     'app_name' => 'Blue Twilight - Install',
     'copyright' => sprintf('© %s <a href="http://www.andyheathershaw.uk/" target="_blank">Andy Heathershaw</a>.', (date('Y') == 2016 ? 2016 : '2016-' . date('Y'))),
+    'license_errors' => [
+        1 => 'The application is not licensed to run on this machine or domain.',
+        2 => 'The application is not licensed to run on this machine or domain.',
+        3 => 'The application is not licensed to run on this machine or domain.',
+        6 => 'The license file provided is invalid.',
+        7 => 'This version of PHP is not supported. Please upgrade to a supported version of PHP or contact support.',
+        9 => 'The application/license has expired.',
+        13 => 'No license is currently available.',
+        20 => 'The application requires an Internet connection that was not available.',
+        99 => 'An unexpected error occurred, please contact support.'
+    ],
     'license_required_p1' => 'Blue Twilight requires a license to run correctly. You can generate and download a license file from the <a href="http://shop.andyheathershaw.uk/user/orders" target="_blank">My Orders</a> page.',
     'license_required_p2' => 'Your license file must match the hostname: :host_name.',
     'license_required_title' => 'License Required',
diff --git a/public/raw/sg-license-error.php b/public/raw/sg-license-error.php
index 00b352c..050c756 100644
--- a/public/raw/sg-license-error.php
+++ b/public/raw/sg-license-error.php
@@ -1,6 +1,24 @@
 <?php
 function btw_license_error($code, $message)
 {
+    // Remove an invalid license file - relevant to index.php as that's the main entry script
+    $licenseFile = sprintf('%s/blue-twilight.lic', dirname(__DIR__));
+
+    if (file_exists($licenseFile))
+    {
+        $number = 0;
+        do
+        {
+            $backupFilename = sprintf('%s_invalid.%d', $licenseFile, $number++);
+        } while (file_exists($backupFilename));
+
+        // Rename or remove the file
+        if (!rename($licenseFile, $backupFilename))
+        {
+            @unlink($licenseFile);
+        }
+    }
+
     header(sprintf('Location: license-required.php?licerror=%d', $code));
     exit();
 }
diff --git a/resources/build/build.php b/resources/build/build.php
index 0dd076f..3e5de10 100644
--- a/resources/build/build.php
+++ b/resources/build/build.php
@@ -56,7 +56,7 @@ system(sprintf('rm -rf %s/tests', $appRoot));
 
 echo 'Licensing and encoding the application using Source Guardian...' . PHP_EOL . PHP_EOL;
 $sgCommand = sprintf(
-    '/usr/local/sourceguardian/bin/sourceguardian --phpversion "5.6" --external "%s" --projid "%s" --projkey "%s" ' .
+    '/usr/local/sourceguardian/bin/sourceguardian --phpversion "5.6" --phpversion "7.0" --external "%s" --projid "%s" --projkey "%s" ' .
         '--stop-on-error --strict-errors --deprec-errors -x "*.blade.php" -x "vendor/*.php" -x "public/raw/*.php" ' .
         '-x public/license-required.php -x public/loader-required.php -x "storage/*" -r -b- ' .
         '-p @./public/raw/sg-license-error.php -j "<?php btw_loader_error(); ?>" --catch ERR_ALL="btw_license_error" "*.php"',