Good morning. I’m having this same issue when I try to install the ReallySimpleCaptcha plugin to run in conjunction with the Contact 7 plugin.
When you advise to turn off all plugins and switch to default theme for the install, do you then turn everything back on after installing ReallySimpleCaptcha? My site is running an ecommerce wordpress theme that uses woo commerce for the shopping cart, so I have quite a few plugins and in-depth theme to “turn off/on”.
I’m running the most recent versions of WordPress and Contact 7.
Thanks in advance for the help.
MC