dans le fichier index.template.php rechercher et supprimer une seule fois
// Show the [Download] button.
Global $modSettings;
if ($modSettings['allow_buttondownload'] == 1)
echo ($current_action=='downloads' || $context['browser']['is_ie4']) ? '<td class="maintab_active_' . $first . '"> </td>' : '' , '
<td valign="top" class="maintab_' , $current_action == 'downloads' ? 'active_back' : 'back' , '">
<a href="', $scripturl, '?action=downloads">' , $txt['text_buttondownload'] , '</a>
</td>' , $current_action == 'downloads' ? '<td class="maintab_active_' . $last . '"> </td>' : '';