Fix download page link

documentation/installation_guide.html

@@ -119,7 +119,7 @@ and a deprecated single-database mode.</span><br />
 <h2><a name="2._Installation_of_Chamilo_LMS"></a><span style="font-weight: bold;">2. Installation of Chamilo LMS</span></h2>
 
 <ol>
-  <li><a href="http://www.chamilo.org/download">Download Chamilo LMS</a></li>
+  <li><a href="http://www.chamilo.org/en/download">Download Chamilo LMS</a></li>
   <li>Unzip it</li>
   <li>Copy the Chamilo directory in your Apache web directory. This can be
     <span style="font-weight: bold;">C:\xampp\htdocs\</span> on a Windows server or <span style="font-weight: bold;">/var/www/html/</span> (or /var/www/chamilo/) on a Linux server</li>