diff --git a/.htaccess b/.htaccess
index 065d1c7d8b..39aec231fc 100755
--- a/.htaccess
+++ b/.htaccess
@@ -1,4 +1,4 @@
-DirectoryIndex index.php
+DirectoryIndex index.php index.html
 
 RedirectMatch 403 \.config$
 
diff --git a/api/index.html b/api/index.html
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/data/.data b/data/.data
old mode 100644
new mode 100755
diff --git a/install/core/Installer.php b/install/core/Installer.php
index 9aadedf9fe..5deb395664 100644
--- a/install/core/Installer.php
+++ b/install/core/Installer.php
@@ -295,7 +295,6 @@ class Installer
 	public function fixAjaxPermission($url = null)
 	{
 		$permission = array(0644, 0755);
-
 		$fileManager = $this->app->getContainer()->get('fileManager');
 
 		$result = false;
@@ -310,7 +309,7 @@ class Installer
 				$result = $fileManager->getPermissionUtils()->chmod($path, $permission, true);
 			}
 		}
-
+		
 		return $result;
 	}
 
diff --git a/install/core/SystemHelper.php b/install/core/SystemHelper.php
index 95ca7f1819..81c7b11fe5 100644
--- a/install/core/SystemHelper.php
+++ b/install/core/SystemHelper.php
@@ -35,10 +35,21 @@ class SystemHelper
 
 	protected $modRewriteUrl = '/api/v1/Metadata';
 
+	protected $writableDir = 'data';
 
-	public function __construct()
+
+	public function initWritable()
 	{
+		if (is_writable($this->writableDir)) {
+			return true;
+		}
 
+		return false;
+	}
+
+	public function getWritableDir()
+	{
+		return $this->writableDir;
 	}
 
 
@@ -96,92 +107,6 @@ class SystemHelper
 		return $result;
 	}
 
-	public function checkModRewrite()
-	{
-		if ( function_exists('apache_get_modules') && in_array('mod_rewrite',apache_get_modules()) ) {
-			return true;
-		} elseif (isset($_SERVER['IIS_UrlRewriteModule'])) {
-			return true;
-		} elseif (getenv('ESPO_MR')=='On' ) {
-			return true;
-		} elseif (isset($_SERVER['ESPO_MR'])) {
-			return true;
-		} elseif ($this->checkModRewriteByUrl()) {
-			return true;
-		}
-
-		return false;
-	}
-
-	protected function checkModRewriteByUrl()
-	{
-		$url = $this->getBaseUrl().$this->modRewriteUrl;
-
-		if (!$this->isCurl()) {
-			$httpCode = $this->getHttpCodeByCurl($url);
-		}
-
-		$httpCode = $this->getHttpCodeByHeader($url);
-
-		if ($httpCode != false && !empty($httpCode)) {
-			if ($httpCode == '200' || $httpCode == '401') {
-				return true;
-			}
-		}
-
-		return false;
-	}
-	
-	public function getModRewriteUrl()
-	{
-		return $this->modRewriteUrl;
-	}
-
-	protected function getHttpCodeByCurl($url)
-	{
-		$ch = curl_init($url);
-
-		curl_setopt($ch, CURLOPT_NOSIGNAL, 1);
-		curl_setopt($ch, CURLOPT_TIMEOUT, 5);
-
-		$response = curl_exec($ch);
-		$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
-
-		curl_close($ch);
-
-		if ($response != false && !empty($httpCode)) {
-			return $httpCode;
-		}
-
-		return false;
-	}
-
-	protected function getHttpCodeByHeader($url)
-	{
-		stream_context_set_default(
-			array(
-				'http' => array(
-					'timeout' => 3.0,
-				)
-			)
-		);
-		$headers = get_headers($url);
-
-		if ($headers != false) {
-
-			preg_match('/HTTP.*([0-9]{3})/i', $headers[0], $match);
-
-			return $httpCode = trim($match[1]);
-		}
-
-		return false;
-	}
-
-	protected function isCurl()
-	{
-		return function_exists('curl_version');
-	}
-
 	public function getBaseUrl()
 	{
 		$pageUrl = ($_SERVER["HTTPS"] == 'on') ? 'https://' : 'http://';
@@ -197,6 +122,10 @@ class SystemHelper
 		return $baseUrl;
 	}
 
+	public function getModRewriteUrl()
+	{
+		return $this->modRewriteUrl;
+	}
 
 	/**
 	 * Get web server name
@@ -208,9 +137,123 @@ class SystemHelper
 		$serverSoft = $_SERVER['SERVER_SOFTWARE'];
 
 		preg_match('/^(.*)\//i', $serverSoft, $match);
+		if (empty($match[1])) {
+			preg_match('/^(.*)\/?/i', $serverSoft, $match);
+		}
 		$serverName = strtolower( trim($match[1]) );
 
 		return $serverName;
 	}
 
+	/**
+	 * Get Operating System of web server. Details http://en.wikipedia.org/wiki/Uname
+	 *
+	 * @return string  Ex. "windows", "mac", "linux"
+	 */
+	public function getOS()
+	{
+		$osList = array(
+			'windows' => array(
+				'win',
+				'UWIN',
+			),
+			'mac' => array(
+				'mac',
+				'darwin',
+			),
+			'linux' => array(
+				'linux',
+				'cygwin',
+				'GNU',
+				'FreeBSD',
+				'OpenBSD',
+				'NetBSD',
+			),
+		);
+
+		$sysOS = strtolower(PHP_OS);
+
+		foreach ($osList as $osName => $osSystem) {
+			if (preg_match('/^('.implode('|', $osSystem).')/i', $sysOS)) {
+				return $osName;
+			}
+		}
+
+		return false;
+	}
+
+
+	public function getRootDir()
+	{
+		$rootDir = dirname(__FILE__);
+
+		$rootDir = preg_replace('/\/install\/core\/?/', '', $rootDir, 1);
+
+		return $rootDir;
+	}
+
+	public function getPhpBin()
+	{
+		return (defined("PHP_BINDIR"))? PHP_BINDIR.DIRECTORY_SEPARATOR.'php' : 'php';
+	}
+
+	public function getChmodCommand($path, $permissions = array('755'), $isFile = null)
+	{
+		$path = $this->getFullPath($path);
+
+		if (is_string($permissions)) {
+			$permissions = (array) $permissions;
+		}
+
+		if (!isset($isFile) && count($permissions) == 1) {
+			return 'chmod -R '.$permissions[0].' '.$path;
+		}
+
+		$bufPerm = (count($permissions) == 1) ?  array_fill(0, 2, $permissions[0]) : $permissions;
+
+		$commands = array();
+		$commands[] = 'chmod '.$bufPerm[0].' $(find '.$path.' -type f)';
+		$commands[] = 'chmod '.$bufPerm[1].' $(find '.$path.' -type d)';
+
+		if (count($permissions) >= 2) {
+			return implode(' && ', $commands);
+		}
+
+		return $isFile ? $commands[0] : $commands[1];
+	}
+
+	public function getChownCommand($path)
+	{
+		$owner = posix_getuid();
+		$group = posix_getegid();
+
+		if (empty($owner) || empty($group)) {
+			return null;
+		}
+
+		return 'chown -R '.$owner.':'.$group.' '.$this->getFullPath($path);
+	}
+
+	public function getFullPath($path)
+	{
+		if (!empty($path)) {
+			$path = DIRECTORY_SEPARATOR . $path;
+		}
+
+		return $this->getRootDir() . $path;
+	}
+
+	public function getPermissionCommands($path, $permissions = array('644', '755'), $isFile = null)
+	{
+		$commands = array();
+		$commands[] = $this->getChmodCommand($path, $permissions, $isFile);
+
+		$chown = $this->getChownCommand($path);
+		if (isset($chown)) {
+			$commands[] = $chown;
+		}
+
+		return implode(' && ', $commands);
+	}
+
 }
diff --git a/install/core/actions/finish.php b/install/core/actions/finish.php
index 4c4d4f04af..90d89125e0 100644
--- a/install/core/actions/finish.php
+++ b/install/core/actions/finish.php
@@ -18,20 +18,15 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
- ************************************************************************/ 
- 
-
+ ************************************************************************/
 
 $serverType = $systemHelper->getServerType();
-$serverType = 'microsoft-iis';
-$rootDir = dirname(__FILE__);
-$rootDir = preg_replace('/\/install\/core\/actions\/?/', '', $rootDir, 1);
-$cronFile = $rootDir.DIRECTORY_SEPARATOR.'cron.php';
-$phpBinDir = (defined("PHP_BINDIR"))? PHP_BINDIR.DIRECTORY_SEPARATOR.'php' : 'php';
+
+$cronFile = $systemHelper->getRootDir().DIRECTORY_SEPARATOR.'cron.php';
 
 $cronHelp = (isset($langs['cronHelp'][$serverType]))? $langs['cronHelp'][$serverType] : $langs['cronHelp']['default'];
 $cronHelp = str_replace('<cron-file>', $cronFile, $cronHelp);
-$cronHelp = str_replace('<php-bin-dir>', $phpBinDir, $cronHelp);
+$cronHelp = str_replace('<php-bin-dir>', $systemHelper->getPhpBin(), $cronHelp);
 $cronTitle = (isset($langs['cronTitle'][$serverType]))? $langs['cronTitle'][$serverType] : $langs['cronTitle']['default'];
 
 $smarty->assign('cronTitle', $cronTitle);
diff --git a/install/core/actions/fixAjaxPermission.php b/install/core/actions/fixAjaxPermission.php
index 6d69856507..d300bf1179 100644
--- a/install/core/actions/fixAjaxPermission.php
+++ b/install/core/actions/fixAjaxPermission.php
@@ -18,7 +18,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
- ************************************************************************/ 
+ ************************************************************************/
 
 ob_start();
 $result = array('success' => false, 'errors' => array());
@@ -30,8 +30,9 @@ if (!empty($_REQUEST['url'])) {
 	else {
 		$result['success'] = false;
 		$result['errorMsg'] = $_REQUEST['url'];
+		$result['errorFixInstruction'] = $systemHelper->getPermissionCommands($_REQUEST['url'], array('644', '755'));
 	}
 }
 
 ob_clean();
-echo json_encode($result);
\ No newline at end of file
+echo json_encode($result);
diff --git a/install/core/actions/settingsTest.php b/install/core/actions/settingsTest.php
index bb4c1fdfc0..4ca9682b33 100644
--- a/install/core/actions/settingsTest.php
+++ b/install/core/actions/settingsTest.php
@@ -30,17 +30,6 @@ if (!empty($res['errors'])) {
 	$result['errors'] = array_merge($result['errors'], $res['errors']);
 }
 
-/*if (!$systemHelper->checkModRewrite()) {
-	$result['success'] = false;
-	$result['errors']['modRewrite'] = $langs['modRewriteHelp']['default'];
-
-	$serverType = $systemHelper->getServerType();
-	if (isset($langs['modRewriteHelp'][$serverType])) {
-		$result['errors']['modRewrite'] = $langs['modRewriteHelp'][$serverType];
-	}
-}*/
-
-
 if (!empty($_REQUEST['dbName']) && !empty($_REQUEST['hostName']) && !empty($_REQUEST['dbUserName'])) {
 	$connect = false;
 
diff --git a/install/core/i18n/en_US.php b/install/core/i18n/en_US.php
index 50b550acf8..a9f4c77f16 100644
--- a/install/core/i18n/en_US.php
+++ b/install/core/i18n/en_US.php
@@ -23,6 +23,7 @@
 return array(
 	'Main page title' => 'Welcome to EspoCRM',
 	'Main page header' => '',
+	'Bad init Permission' => 'Permission denied for "{*}" directory. Please set 775 for "{*}" or just execute this command in the terminal <pre><b>{C}</b></pre>',
 	'Start page title' => 'License Agreement',
 	'Step1 page title' => 'License Agreement',
 	'License Agreement' => 'License Agreement',
@@ -88,6 +89,7 @@ return array(
 	'Ajax failed' => 'Ajax failed',
 	'Cannot create user' => 'Cannot create user',
 	'Permission denied' => 'Permission denied',
+	'permissionInstruction' => '<br>Run this in Terminal<pre><b>"{C}"</b></pre>',
 	'Cannot write to files' => 'Cannot write to file(s)',
 	'Can not save settings' => 'Can not save settings',
 	'Cannot save preferences' => 'Cannot save preferences',
@@ -97,6 +99,20 @@ return array(
 		'pdo_mysql' => 'PDO MySQL',
 	),
 
+	'modRewriteInstruction' => array(
+		'apache' => array(
+			'linux' => '<br><br>Run those commands in Terminal<pre><b>1. a2enmod rewrite <br>2. service apache2 restart</b></pre>',
+			'windows' => '<br> <pre>1. Find the httpd.conf file (usually you will find it in a folder called conf, config or something along those lines)<br>
+2. Inside the httpd.conf file uncomment the line LoadModule rewrite_module modules/mod_rewrite.so (remove the pound \'#\' sign from in front of the line)<br>
+3. Also find the line ClearModuleList is uncommented then find and make sure that the line AddModule mod_rewrite.c is not commented out.
+</pre>',
+		),
+		'microsoft-iis' => array(
+			'windows' => '',
+
+		),
+	),
+
 	'modRewriteHelp' => array(
 		'apache' => 'Enable "mod_rewrite" in Apache server',
 		'nginx' => 'Add this code to Nginx Host Config (inside "server" block):<br>
diff --git a/install/core/tpl/errors.tpl b/install/core/tpl/errors.tpl
index 3b99bc6629..b18080e7a6 100644
--- a/install/core/tpl/errors.tpl
+++ b/install/core/tpl/errors.tpl
@@ -25,10 +25,11 @@
 			langs: {$langsJs},
 			ajaxUrls: {$ajaxUrls},
 			modRewriteUrl: '{$modRewriteUrl}',
-			serverType: '{$serverType}'
+			serverType: '{$serverType}',
+			OS: '{$OS}'
 		}
 	{literal}
 		var installScript = new InstallScript(opt);
 	})
 	{/literal}
-</script>
\ No newline at end of file
+</script>
diff --git a/install/core/tpl/step3.tpl b/install/core/tpl/step3.tpl
index 26b27274fd..0135e52738 100644
--- a/install/core/tpl/step3.tpl
+++ b/install/core/tpl/step3.tpl
@@ -52,10 +52,11 @@
 			langs: {$langsJs},
 			ajaxUrls: {$ajaxUrls},
 			modRewriteUrl: '{$modRewriteUrl}',
-			serverType: '{$serverType}'
+			serverType: '{$serverType}',
+			OS: '{$OS}'
 		}
 	{literal}
 		var installScript = new InstallScript(opt);
 	})
 	{/literal}
-</script>
\ No newline at end of file
+</script>
diff --git a/install/index.php b/install/index.php
index 6efa772936..a4c8225bb9 100644
--- a/install/index.php
+++ b/install/index.php
@@ -20,17 +20,37 @@
  * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
  ************************************************************************/
 
-error_reporting(0);
+//error_reporting(-1);
 session_start();
 
 require_once('../bootstrap.php');
 
+// get user selected language
+$userLang = (!empty($_SESSION['install']['user-lang']))? $_SESSION['install']['user-lang'] : 'en_US';
+$langFileName = 'core/i18n/'.$userLang.'.php';
+$langs = array();
+if (file_exists('install/'.$langFileName)) {
+	$langs = include($langFileName);
+} else {
+	$langs = include('core/i18n/en_US.php');
+}
+
+require_once 'core/SystemHelper.php';
+$systemHelper = new SystemHelper();
+
+if (!$systemHelper->initWritable()) {
+	$dir = $systemHelper->getWritableDir();
+
+	$message = $langs['Bad init Permission'];
+	$message = str_replace('{*}', $dir, $message);
+	$message = str_replace('{C}', $systemHelper->getPermissionCommands($dir, '775'), $message);
+	die($message);
+}
+
 require_once ('install/vendor/smarty/libs/Smarty.class.php');
 
 require_once 'core/Installer.php';
 
-require_once 'core/SystemHelper.php';
-
 $smarty = new Smarty();
 $installer = new Installer();
 
@@ -60,21 +80,9 @@ if (!empty($_REQUEST)) {
 	}
 }
 
-// get user selected language
-$userLang = (!empty($_SESSION['install']['user-lang']))? $_SESSION['install']['user-lang'] : 'en_US';
-$langFileName = 'core/i18n/'.$userLang.'.php';
-$langs = array();
-if (file_exists('install/'.$langFileName)) {
-	$langs = include($langFileName);
-} else {
-	$langs = include('core/i18n/en_US.php');
-}
-
 $smarty->assign("langs", $langs);
 $smarty->assign("langsJs", json_encode($langs));
 
-$systemHelper = new SystemHelper();
-
 // include actions and set tpl name
 $tplName = 'main.tpl';
 $actionsDir = 'core/actions';
@@ -95,6 +103,8 @@ switch ($action) {
 		$smarty->assign("modRewriteUrl", $modRewriteUrl);
 		$serverType = $systemHelper->getServerType();
 		$smarty->assign("serverType", $serverType);
+		$os = $systemHelper->getOS();
+		$smarty->assign("OS", $os);
 		break;
 
     case 'step4':
diff --git a/install/js/install.js b/install/js/install.js
index 81a1905c78..da46e1b7fe 100644
--- a/install/js/install.js
+++ b/install/js/install.js
@@ -42,6 +42,10 @@ var InstallScript = function(opt) {
 	if (typeof(opt.serverType) !== 'undefined') {
 		this.serverType = opt.serverType;
 	}
+	
+	if (typeof(opt.OS) !== 'undefined') {
+		this.OS = opt.OS;
+	}
 
 	this.connSett = {};
 	this.userSett = {};
@@ -525,6 +529,7 @@ InstallScript.prototype.checkAjaxPermission = function() {
 	this.ajaxUrlFinished = 0;
 	this.ajaxUrlPermRes = true;
 	this.ajaxUrlPermMsgs = [];
+	this.ajaxUrlPermInstructions = [];
 
 	var len = this.ajaxUrls.length;
 	for (var count = 0; count < len; count++) {
@@ -600,6 +605,9 @@ InstallScript.prototype.callbackAjaxPerm = function(data) {
 	if (typeof(data.success) != 'undefined' && !data.success) {
 		this.ajaxUrlPermRes = false;
 		this.ajaxUrlPermMsgs.push(data.errorMsg);
+		if (typeof(data.errorFixInstruction) != 'undefined') {
+			this.ajaxUrlPermInstructions.push(data.errorFixInstruction);
+		}
 	}
 
 	if (this.ajaxUrlFinished == this.ajaxUrls.length) {
@@ -608,7 +616,10 @@ InstallScript.prototype.callbackAjaxPerm = function(data) {
 			'success': this.ajaxUrlPermRes
 		}
 		if (!this.ajaxUrlPermRes) {
-			var errorMsg = this.getLang('Permission denied') + ':<br>' + this.ajaxUrlPermMsgs.join('<br>');
+			var errorMsg = this.getLang('Permission denied') + ' ( ' + this.ajaxUrlPermMsgs.join(', ') + ' ) .';
+			if (this.ajaxUrlPermInstructions.length > 0) {
+				errorMsg += '<br>' + this.getLang('permissionInstruction').replace('"{C}"', this.ajaxUrlPermInstructions.join('<br>'));
+			}
 			ajaxData.errorMsg = errorMsg;
 		}
 		this.checkAction(ajaxData);
@@ -625,8 +636,10 @@ InstallScript.prototype.callbackModRewrite = function(data) {
 		return;
 	}
 	ajaxData.success = false;
-	ajaxData.errorMsg = (typeof(this.langs) !== 'undefined' && typeof(this.langs['modRewriteHelp'][this.serverType]) !== 'undefined')? this.langs['modRewriteHelp'][this.serverType] : this.langs['modRewriteHelp']['default'];
-	
+	if (typeof(this.langs) !== 'undefined') {
+		ajaxData.errorMsg = (typeof(this.langs['modRewriteHelp'][this.serverType]) !== 'undefined')? this.langs['modRewriteHelp'][this.serverType] : this.langs['modRewriteHelp']['default'];
+		ajaxData.errorMsg += (typeof(this.langs['modRewriteInstruction'][this.serverType]) !== 'undefined' && typeof(this.langs['modRewriteInstruction'][this.serverType][this.OS]) !== 'undefined') ? this.langs['modRewriteInstruction'][this.serverType][this.OS] : '';
+	}
 	var realCheckIndex = this.checkIndex - 1;
 	if (typeof(this.checkActions[realCheckIndex]) != 'undefined'
 		&& typeof(this.checkActions[realCheckIndex].break) != 'undefined') {