title: I can't upgrade WordPress
body: <p>I transferred a 10 websites from one to another server. All sites use WordPress.
  When i tried to upgrade to WordPress 3.8.3 using update now link on the dashboard I am getting this error message.</p>
  
  <pre><code>Downloading update from https://downloads.wordpress.org/release/sr_RS/wordpress-3.8.3.zip…
  
  Download failed.: Operation timed out after 300000 milliseconds with 523957 out of 6327138 bytes received
  
  Installation Failed
  </code></pre>
  
  <p>Plugin Update works fine. WordPress just will not update.
  At all sites the same error.</p>
  
  <p>On the old server it works fine. On the new server everything works except the update WordPress.</p>