Установка: Админка -> Управление дизайном -> Каталог файлов(новости сайта или любой другой модуль) -> Страница материала и комментариев к нему -> ищем тег "$MESSAGE$" и после него вставляйте этот код:

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Ссылки на скачивания всегда работают! Никогда не бывают битые и пр.