Honestly, I don't remember having installed this program in the past, so downloaded and attempted to install it the other day because the contact form is failing. When you load the contact page, above submit you get the message/error:

Security Check: Invalid site key. Please see the FAQ.

You get no recaptcha image. The FAQ referred to takes you to google recaptcha. I looked all throughout the filesystem and database and zen-cart admin and could not find a way to set the recaptcha keys. The form was working until recently. Since I couldn't figure out why/what I thought installing a new recaptcha might be an alternate fix.

If I can't figure out either/or, I'll probably just create an HTML mirror of the contact page (as php) and use one of my forms, perhaps with bootstrap. Scratching my head first though.