[Plugin: Events Manager] captcha not working without https

Did you add captcha in events manager using custom addon?

if you’re using Pro, ask on the pro forums, if you’re using another Captcha plugin for this, you need to ask the devs about this.

I’m not using pro(yet). I thought i use the standard captcha:

Really simple captcha -> https://ideasilo.wordpress.com/2009/03/14/really-simple-captcha/

Is anyone using another captcha?