Hi,
You have to copy the content of the free package in the specified location from the wordpress install instructions for Countdown FX and then add this code in the text widget from your sidebar:
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="600" height="200" id="countdown" align="middle">
<param name="allowScriptAccess" value="sameDomain" />
<param name="allowFullScreen" value="false" />
<param name="movie" value="wp-content/flashxml/countdown-fx/countdown.swf" />
<param name="quality" value="high" />
<param name="salign" value="tl" />
<param name="scale" value="noscale" />
<param name="wmode" value="transparent" />
<param name="bgcolor" value="#ffffff" />
<param name="flashvars" value="folderPath=wp-content/flashxml/countdown-fx/" />
<embed src="wp-content/flashxml/countdown-fx/countdown.swf" quality="high" scale="noscale" bgcolor="#ffffff" width="600" height="200" name="countdown" align="middle" salign="tl" wmode="transparent" allowScriptAccess="sameDomain" allowFullScreen="false" flashvars="folderPath=wp-content/flashxml/countdown-fx/" type="application/x-shockwave-flash" pluginspage="http://www.adobe.com/go/getflashplayer" />
</object>
