The link is not dead. But it shows an empty while page.
Page source is:

HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
<html>
<head>
<title>Gamestudio Manual</title>
<meta name="keywords" content=" " />
<meta name="description" content="Gamestudio game development system" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
</head>
<frameset rows="100%">
<frame src="http://www.conitec.net/beta/" title="Gamestudio Manual" frameborder="0" noresize="noresize"/>
<noframes>
<body>
<h1>Gamestudio Manual</h1>
<p><a href="http://www.conitec.net/beta/">https://manual.3dgamestudio.net</a>     </p>
</body>
</noframes>
</frameset>
</html>