Index: branches/5.2.x/core/install.php
===================================================================
diff -u -N -r16692 -r16705
--- branches/5.2.x/core/install.php	(.../install.php)	(revision 16692)
+++ branches/5.2.x/core/install.php	(.../install.php)	(revision 16705)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: install.php 16692 2021-08-31 09:24:09Z alex $
+* @version	$Id: install.php 16705 2022-07-08 13:51:31Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -160,7 +160,11 @@
 			$this->toolkit = new kInstallToolkit();
 			$this->toolkit->setInstallator($this);
 			$this->StepDBFile = FULL_PATH.'/'.REL_PATH.'/install/steps_db.xml';
-			$this->baseURL = 'http://' . $_SERVER['HTTP_HOST'] . $this->toolkit->systemConfig->get('WebsitePath', 'Misc') . '/core/install/';
+
+			$https_mark = isset($_SERVER['HTTPS']) ? $_SERVER['HTTPS'] : false;
+			$protocol = ($https_mark == 'on') || ($https_mark == '1') ? 'https://' : 'http://';
+			$this->baseURL = $protocol . $_SERVER['HTTP_HOST'] . $this->toolkit->systemConfig->get('WebsitePath', 'Misc') . '/core/install/';
+
 			set_error_handler( Array(&$this, 'ErrorHandler') );
 
 			if ( $this->toolkit->systemConfigFound() ) {
Index: branches/5.2.x/core/kernel/startup.php
===================================================================
diff -u -N -r16633 -r16705
--- branches/5.2.x/core/kernel/startup.php	(.../startup.php)	(revision 16633)
+++ branches/5.2.x/core/kernel/startup.php	(.../startup.php)	(revision 16705)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: startup.php 16633 2018-11-01 08:51:41Z alex $
+* @version	$Id: startup.php 16705 2022-07-08 13:51:31Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -30,7 +30,7 @@
 		echo 'Please use the installation script to fix the problem.<br/><br/>';
 
 		$base_path = rtrim(str_replace('\\', '/', dirname($_SERVER['PHP_SELF'])), '/');
-		echo '<a href="http://' . $_SERVER['HTTP_HOST'] . $base_path . '/core/install.php">Go to installation script</a><br/><br/>';
+		echo '<a href="//' . $_SERVER['HTTP_HOST'] . $base_path . '/core/install.php">Go to installation script</a><br/><br/>';
 		flush();
 		exit;
 	}