Help me embed simple script

Hi Forum,
Just started php and newbie.
Wanna embed this captcha script to my form:
https://www.phpcaptcha.org/download/
I had the very old version working for many years but it’s stopped working because of some PHP update.
So copied the whole new version to my server, but even with this guide could not get it work:
https://www.phpcaptcha.org/documentation/quickstart-guide/
So how to upload my HTML/PHP form here so someone can help me with that?
I have integrated the code but it ALWAYS accepts even if you enter wrong value AND with no sending email.

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