Install Buttons not working

<!doctype html>
<html>
  <head>
    <link href="https://s3.amazonaws.com/codecademy-content/projects/bootstrap.min.css" rel="stylesheet" />
    <link href="css/main.css" rel="stylesheet" />

<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.5/angular.min.js"></script>
  </head>
  <body ng-app="AppMarketApp">
    <div class="header">
      <div class="container">
        <h1>App Market</h1>
      </div>
    </div>

<script src="js/app.js"></script>

<script src="js/controllers/MainController.js"></script>

<script src="js/directives/appInfo.js"></script>
    <script src="js/directives/installApp.js"></script>

</body>
</html>

https://ajax.googleapis.com/ajax/libs/angularjs/1.3.5/angular.min.js