[+] Install: new installer reworked from scratch

install-new/upgrade/functions/update_for_13version.php

@@ -0,0 +1,16 @@
+<?php
+
+function update_for_13version()
+{
+	global $oldversion;
+	
+	if (version_compare($oldversion, '1.4.0.1') >= 0)
+		return; // if the old version is a 1.4 version
+	
+	// Disable the Smarty 3
+	Configuration::updateValue('PS_FORCE_SMARTY_2', 1);
+	// Disable the URL rewritting
+	Configuration::updateValue('PS_REWRITING_SETTINGS', 0);
+	// Disable Canonical redirection
+	Configuration::updateValue('PS_CANONICAL_REDIRECT', 0);
+}