How to bind reCAPTCHA to the download button on the site?

Question

reCAPTCHA

Good afternoon. Please tell me how to bind reCAPTCHA to this button. So that when clicked, reCAPTCHA would be displayed and after passing it, a link would open [xfgiven_download-link]

[xfgiven_download-link]
        <a href="http://katvin.com/?[xfvalue_download-link]"class='multi-line-button red'  style='width:auto;' target="_blank">
        <span class='title'>Бесплатное скачивание</span>
        <span class='subtitle'>{title}</span>
        </a>
[/xfgiven_download-link]