Click Installed if you use it D

In Showthread template
Find:

<div id="posts">$postbits<div id="lastpost"></div></div>

Add Below:
<div id="posts">$postbits<div id="lastpost"></div></div>

<div style="padding:0px 0px $stylevar[cellpadding]px 0px">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="96%" align="center">
<tr>
<td class="thead" align="left">MegaUpload</td>
</tr>
<tr>
<td class="alt1" align="center">

<br>
<br>
<b><i>
<embed src="http://www.megaupload.com/filebox/?t=2&c=2&u=13178909.3b6dda5d12" type="application/x-shockwave-flash" width="350" height="90" wmode="transparent"></embed></a></b></i>
</td>
</tr>
</table>
</div>