nequx,
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="download" style="display:none;">
любой текст и код
</div>
<a href="ссылка" class="takru" target="_blank">тут реклама</a>
<script>
document.onclick = function (event) {
if (event.target.classList.contains('takru')) {
document.getElementById("download").style.display = "block"
}
}
</script>
</body>
</html>