Updating Cookies

I’m looking for how I can better translate a cookie I’m tracking when someone comes to my site and then downloads a file. Basically, I have a cookie that I’m pushing back to them that now allows me to track them. They’ve just given me their email and I’d like to link these two things together.

I’m doing a simple CF7 form where they enter their email and click the Download button which then logs the info for me, sends me an email to let me know, and then creates an inline link for the file. If I can insert a little javascript into that process, I can get what I’m looking for. Its as simple as adding in:

<script>
$zoho.salesiq.visitor.email(“[your-email]”);
</script>

Except that I don’t want my change to constantly break if I update the plugin nor am I sure how to grab the email address from CF7 when it passes back over to EBD to allow the download link to appear.

Would love some suggestions!