diff --git a/core/Configuration/.gitignore b/core/Configuration/.gitignore
old mode 100644
new mode 100755
diff --git a/core/Configuration/.htaccess b/core/Configuration/.htaccess
old mode 100644
new mode 100755
diff --git a/core/Configuration/Configuration.class.php b/core/Configuration/Configuration.class.php
old mode 100644
new mode 100755
diff --git a/core/Configuration/CreateDatabase.class.php b/core/Configuration/CreateDatabase.class.php
old mode 100644
new mode 100755
diff --git a/core/Documents/Install.class.php b/core/Documents/Install.class.php
index 2d14bf2..94aa1a5 100644
--- a/core/Documents/Install.class.php
+++ b/core/Documents/Install.class.php
@@ -153,6 +153,7 @@ namespace Documents\Install {
       if(!$success) {
         $msg = "The following requirements failed the check:<br>" .
           $this->createUnorderedList($failedRequirements);
+        $this->errorString = $msg;
       }
 
       return array("success" => $success, "msg" => $msg);
@@ -632,7 +633,7 @@ namespace Documents\Install {
 
       if(isset($currentView["progressText"])) {
         $progressText = $currentView["progressText"];
-        $html .= "<div id=\"progressText\" class=\"my-3\">$progressText$spinnerIcon</i></div>";
+        $html .= "<div id=\"progressText\" style=\"display:none\" class=\"my-3\">$progressText$spinnerIcon</i></div>";
       }
 
       if(isset($currentView["form"])) {
@@ -660,7 +661,11 @@ namespace Documents\Install {
       );
 
       if($this->currentStep != self::FINISH_INSTALLATION) {
-        $buttons[] = array("title" => "Submit", "type" => "success", "id" => "btnSubmit", "float" => "right");
+        if ($this->currentStep == self::CHECKING_REQUIRMENTS) {
+          $buttons[] = array("title" => "Retry", "type" => "success", "id" => "btnRetry", "float" => "right");
+        } else {
+          $buttons[] = array("title" => "Submit", "type" => "success", "id" => "btnSubmit", "float" => "right");
+        }
       } else {
         $buttons[] = array("title" => "Finish", "type" => "success", "id" => "btnFinish", "float" => "right");
       }
@@ -703,7 +708,7 @@ namespace Documents\Install {
       $this->steps = array(
         self::CHECKING_REQUIRMENTS => array(
           "title" => "Checking requirements",
-          "status" => self::NOT_STARTED
+          "status" => self::ERROR
         ),
         self::DATABASE_CONFIGURATION => array(
           "title" => "Database configuration",
@@ -737,6 +742,7 @@ namespace Documents\Install {
       // POST
       if($_SERVER['REQUEST_METHOD'] == 'POST') {
         $response = $this->performStep();
+        $response["step"] = $this->currentStep;
         die(json_encode($response));
       }
 
diff --git a/index.php b/index.php
index 8d25306..6cf38d3 100644
--- a/index.php
+++ b/index.php
@@ -66,6 +66,7 @@ if(isset($_GET["api"]) && is_string($_GET["api"])) {
       header("Location: /");
     } else {
       $document = new Documents\Install($user);
+      $response = $document->getCode();
     }
   } else {
     if(empty($documentName) || strcasecmp($documentName, "install") === 0) {
@@ -83,9 +84,9 @@ if(isset($_GET["api"]) && is_string($_GET["api"])) {
     } else {
       $document = new $class($user);
     }
-  }
 
-  $response = $document->getCode();
+    $response = $document->getCode();
+  }
 }
 
 $user->sendCookies();
diff --git a/js/install.js b/js/install.js
index d980596..c7cc44a 100644
--- a/js/install.js
+++ b/js/install.js
@@ -38,12 +38,16 @@ function setState(state) {
   li.find("i").removeClass().addClass(icon);
 }
 
+function getCurrentStep() {
+  return $("#currentStep").index() + 1;
+}
+
 function sendRequest(params, done) {
   setState(PENDING);
   var success = false;
   $("#status").hide();
   $.post("/index.php", params, function(data) {
-    if(data.success) {
+    if(data.success || data.step != getCurrentStep()) {
       success = true;
       window.location.reload();
     } else {