This should do the trick.
Open pages.php
FIND:
Code:
# Assign the current location line
$smarty->assign("location", $location);
BEFORE ADD:
Code:
if ($active_modules["Bestsellers"])
include $xcart_dir."/modules/Bestsellers/bestsellers.php";
In your static page use:
Code:
{if $active_modules.Bestsellers ne ""}
{include file="modules/Bestsellers/bestsellers.tpl"}
{else}
Provide a disabled message.
{/if}