Ok
so I have installed the plugin, enabled askimet and captcha.
GD and free type lib are enables on the server.
the /wpcf7_captcha folder has been created in wp-content/uploads.
And permissions are set to write.
YET
This contact form contains CAPTCHA fields, but the temporary folder for the files (/public_html/.../wp-content/uploads/wpcf7_captcha/wpcf7_captcha) does not exist or is not writable. You can create the folder or change its permission manually.
Oddly it says wpcf7_captcha/wpcf7_captcha...
Anyway it doesn't work at all!