diff --git a/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit b/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit
index 707fc93..3facf76 100644
--- a/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit
+++ b/onebuttoninstaller/ext/ext/onebuttoninstaller/fail2ban.postinit
@@ -3,10 +3,9 @@ $command = "fail2ban_start.sh";
 $cmd = dirname(__FILE__)."/".$command;
 require_once("config.inc");
 require_once("functions.inc");
-        $i =0;
 		if ( is_array($config['rc']['postinit'] ) && is_array( $config['rc']['postinit']['cmd'] ) ) {
-            for ($i; $i < count($config['rc']['postinit']['cmd']);) {
-                if (preg_match("/$command/", $config['rc']['postinit']['cmd'][$i])) break; ++$i; }
+            for ($i = 0; $i < count($config['rc']['postinit']['cmd']); $i++) {
+                if (preg_match("/$command/", $config['rc']['postinit']['cmd'][$i])) break; }
         }
         $config['rc']['postinit']['cmd'][$i] = $config['cmd']."$cmd";
 		write_config();
diff --git a/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit b/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit
index bfe902a..b028938 100644
--- a/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit
+++ b/onebuttoninstaller/ext/ext/onebuttoninstaller/mcommander.postinit
@@ -3,10 +3,9 @@ $command = "mcommander.sh";
 $cmd = dirname(__FILE__)."/".$command;
 require_once("config.inc");
 require_once("functions.inc");
-        $i =0;
 		if ( is_array($config['rc']['postinit'] ) && is_array( $config['rc']['postinit']['cmd'] ) ) {
-            for ($i; $i < count($config['rc']['postinit']['cmd']);) {
-                if (preg_match("/$command/", $config['rc']['postinit']['cmd'][$i])) break; ++$i; }
+            for ($i = 0; $i < count($config['rc']['postinit']['cmd']); $i++) {
+                if (preg_match("/$command/", $config['rc']['postinit']['cmd'][$i])) break; }
         }
         $config['rc']['postinit']['cmd'][$i] = $config['cmd']."$cmd";
 		write_config();
diff --git a/onebuttoninstaller/ext/onebuttoninstaller-config.php b/onebuttoninstaller/ext/onebuttoninstaller-config.php
index 71ae02a..cb6954e 100644
--- a/onebuttoninstaller/ext/onebuttoninstaller-config.php
+++ b/onebuttoninstaller/ext/onebuttoninstaller-config.php
@@ -83,15 +83,17 @@ if (isset($_POST['save']) && $_POST['save']) {
         if (isset($_POST['enable'])) {
             $config['onebuttoninstaller']['storage_path'] = !empty($_POST['storage_path']) ? $_POST['storage_path'] : $g['media_path'];
             $config['onebuttoninstaller']['storage_path'] = rtrim($config['onebuttoninstaller']['storage_path'],'/');         // ensure to have NO trailing slash
-            if (strpos($config['onebuttoninstaller']['storage_path'], "/mnt/") === false) {
+            if (!isset($_POST['path_check']) && (strpos($config['onebuttoninstaller']['storage_path'], "/mnt/") === false)) {
                 $input_errors[] = gettext("The common directory for all extensions MUST be set to a directory below <b>'/mnt/'</b> to prevent to loose the extensions after a reboot on embedded systems!");
             }
             else {
                 if (!is_dir($config['onebuttoninstaller']['storage_path'])) mkdir($config['onebuttoninstaller']['storage_path'], 0775, true);
                 change_perms($_POST['storage_path']);
+                $config['onebuttoninstaller']['path_check'] = isset($_POST['path_check']) ? true : false;
                 $config['onebuttoninstaller']['auto_update'] = isset($_POST['auto_update']) ? true : false;
                 $config['onebuttoninstaller']['show_beta'] = isset($_POST['show_beta']) ? true : false;
                 $savemsg .= get_std_save_message(write_config());
+                require_once("{$config['onebuttoninstaller']['rootfolder']}onebuttoninstaller-start.php");
             }
         }
         else $savemsg .= get_std_save_message(write_config());
@@ -100,9 +102,16 @@ if (isset($_POST['save']) && $_POST['save']) {
 
 $pconfig['enable'] = isset($config['onebuttoninstaller']['enable']) ? true : false;
 $pconfig['storage_path'] = !empty($config['onebuttoninstaller']['storage_path']) ? $config['onebuttoninstaller']['storage_path'] : $g['media_path'];
+$pconfig['path_check'] = isset($config['onebuttoninstaller']['path_check']) ? true : false;
 $pconfig['auto_update'] = isset($config['onebuttoninstaller']['auto_update']) ? true : false;
 $pconfig['show_beta'] = isset($config['onebuttoninstaller']['show_beta']) ? true : false;
 
+$return_val = mwexec("fetch -o {$config['onebuttoninstaller']['rootfolder']}log/version.txt https://raw.github.com/crestAT/nas4free-onebuttoninstaller/master/onebuttoninstaller/version.txt", false);
+if ($return_val == 0) {
+    $server_version = exec("cat {$config['onebuttoninstaller']['rootfolder']}log/version.txt");
+    if ($server_version != $config['onebuttoninstaller']['version']) { $savemsg = sprintf(gettext("New extension version %s available, use '%s' to install the new version!"), $server_version, gettext("Maintenance")); }
+}   //EOversion-check
+
 bindtextdomain("nas4free", "/usr/local/share/locale");                  // to get the right main menu language
 include("fbegin.inc");
 bindtextdomain("nas4free", "/usr/local/share/locale-obi"); ?>
@@ -112,6 +121,7 @@ function enable_change(enable_change) {
     var endis = !(document.iform.enable.checked || enable_change);
 	document.iform.storage_path.disabled = endis;
 	document.iform.storage_pathbrowsebtn.disabled = endis;
+	document.iform.path_check.disabled = endis;
 	document.iform.auto_update.disabled = endis;
 	document.iform.show_beta.disabled = endis;
 }
@@ -138,6 +148,7 @@ function enable_change(enable_change) {
             <?php html_titleline_checkbox("enable", gettext("OneButtonInstaller"), $pconfig['enable'], gettext("Enable"), "enable_change(false)");?>
             <?php html_text("installation_directory", gettext("Installation directory"), sprintf(gettext("The extension is installed in %s"), $config['onebuttoninstaller']['rootfolder']));?>
 			<?php html_filechooser("storage_path", gettext("Common directory"), $pconfig['storage_path'], gettext("Common directory for all extensions (a persistant place where all extensions are/should be - a directory below <b>/mnt/</b>)."), $pconfig['storage_path'], true, 60);?>
+            <?php html_checkbox("path_check", gettext("Path check"), $pconfig['path_check'], gettext("If this option is selected no examination of the common directory path will be carried out (whether it was set to a directory below /mnt/)."), gettext("Please use this option only if you know what you are doing!"), false);?>
             <?php html_checkbox("auto_update", gettext("Update"), $pconfig['auto_update'], gettext("Update extensions list automatically."), "", false);?>
             <?php html_checkbox("show_beta", gettext("Beta releases"), $pconfig['show_beta'], gettext("If enabled, extensions in beta state will be shown in the extensions list."), "", false);?>
         </table>
diff --git a/onebuttoninstaller/ext/onebuttoninstaller-update_extension.php b/onebuttoninstaller/ext/onebuttoninstaller-update_extension.php
index 9b8d7f0..51a0d45 100644
--- a/onebuttoninstaller/ext/onebuttoninstaller-update_extension.php
+++ b/onebuttoninstaller/ext/onebuttoninstaller-update_extension.php
@@ -48,20 +48,19 @@ else { $server_version = gettext("Unable to retrieve version from server!"); }
 if (isset($_POST['ext_remove']) && $_POST['ext_remove']) {
 // remove start/stop commands
     if ( is_array($config['rc']['postinit'] ) && is_array( $config['rc']['postinit']['cmd'] ) ) {
-		for ($i = 0; $i < count($config['rc']['postinit']['cmd']);) {
+		for ($i = 0; $i < count($config['rc']['postinit']['cmd']); $i++) {
     		if (preg_match('/onebuttoninstaller/', $config['rc']['postinit']['cmd'][$i])) { unset($config['rc']['postinit']['cmd'][$i]);} else{}
-		++$i;
 		}
 	}
 	if ( is_array($config['rc']['shutdown'] ) && is_array( $config['rc']['shutdown']['cmd'] ) ) {
-		for ($i = 0; $i < count($config['rc']['shutdown']['cmd']); ) {
+		for ($i = 0; $i < count($config['rc']['shutdown']['cmd']); $i++) {
             if (preg_match('/onebuttoninstaller/', $config['rc']['shutdown']['cmd'][$i])) { unset($config['rc']['shutdown']['cmd'][$i]); } else {}
-		++$i;
 		}
 	}
 // remove extension pages
-	mwexec ("rm -rf /usr/local/www/ext/onebuttoninstaller");
-	mwexec ("rm -rf /usr/local/www/onebuttoninstaller*");
+	mwexec("rm -rf /usr/local/www/ext/onebuttoninstaller");
+	mwexec("rmdir -p /usr/local/www/ext");    // to prevent empty extensions menu entry in top GUI menu if there are no other extensions installed
+	mwexec("rm -rf /usr/local/www/onebuttoninstaller*");
 // unlink created links
     if (is_link("/usr/local/share/locale-obi")) unlink("/usr/local/share/locale-obi");
 // remove application section from config.xml
diff --git a/onebuttoninstaller/ext/onebuttoninstaller.php b/onebuttoninstaller/ext/onebuttoninstaller.php
index a06e9f7..ae28a16 100644
--- a/onebuttoninstaller/ext/onebuttoninstaller.php
+++ b/onebuttoninstaller/ext/onebuttoninstaller.php
@@ -208,6 +208,12 @@ if (isset($_POST['update']) || (isset($config['onebuttoninstaller']['auto_update
     else $errormsg .= gettext("Unable to retrieve extensions list from server!")."<br />";
 }   // EOupdate
 
+$return_val = mwexec("fetch -o {$config['onebuttoninstaller']['rootfolder']}log/version.txt https://raw.github.com/crestAT/nas4free-onebuttoninstaller/master/onebuttoninstaller/version.txt", false);
+if ($return_val == 0) {
+    $server_version = exec("cat {$config['onebuttoninstaller']['rootfolder']}log/version.txt");
+    if ($server_version != $config['onebuttoninstaller']['version']) { $savemsg = sprintf(gettext("New extension version %s available, use '%s' to install the new version!"), $server_version, gettext("Maintenance")); }
+}   //EOversion-check
+
 if (!is_file("{$config['onebuttoninstaller']['rootfolder']}extensions.txt")) $errormsg .= sprintf(gettext("File %s not found!"), "{$config['onebuttoninstaller']['rootfolder']}extensions.txt")."<br />";
 
 bindtextdomain("nas4free", "/usr/local/share/locale");                  // to get the right main menu language
diff --git a/onebuttoninstaller/extensions.txt.SHA512-CHECKSUM b/onebuttoninstaller/extensions.txt.SHA512-CHECKSUM
deleted file mode 100644
index 0645c26..0000000
--- a/onebuttoninstaller/extensions.txt.SHA512-CHECKSUM
+++ /dev/null
@@ -1 +0,0 @@
-c143308bd6f18d8d4c42c1daaab553cb1eeadca1e89db29909b93dfb80b0dc69ed5ea3e5cc91813f3598a9edf414750a101e2a0449d945eedeb448f1252a6132
diff --git a/onebuttoninstaller/onebuttoninstaller-install.php b/onebuttoninstaller/onebuttoninstaller-install.php
index a4f1c37..18fbf85 100644
--- a/onebuttoninstaller/onebuttoninstaller-install.php
+++ b/onebuttoninstaller/onebuttoninstaller-install.php
@@ -29,7 +29,7 @@
     of the authors and should not be interpreted as representing official policies,
     either expressed or implied, of the FreeBSD Project.
 */
-$v = "v0.2";      // extension version
+$v = "v0.3";      // extension version
 $appname = "OneButtonInstaller";
 
 require_once("config.inc");
diff --git a/onebuttoninstaller/release_notes.txt b/onebuttoninstaller/release_notes.txt
index f2706f6..b3688d7 100644
--- a/onebuttoninstaller/release_notes.txt
+++ b/onebuttoninstaller/release_notes.txt
@@ -1,4 +1,6 @@
 Version Date        Description
+0.3     2016.08.14  N: configuration - checkbox to override restriction for extensions installation path 
+                       (limited to a directory under /mnt/)
 0.2     2016.08.09  N: configuration - enable/disable beta releases in extensions list
                     N: check hardware platform to use midnightcommander on i386 too
                     F: disabling extension not possible, leads to an error message
diff --git a/onebuttoninstaller/version.txt b/onebuttoninstaller/version.txt
index 3b04cfb..be58634 100644
--- a/onebuttoninstaller/version.txt
+++ b/onebuttoninstaller/version.txt
@@ -1 +1 @@
-0.2
+0.3