Im sure that this has been answered before, but I have no luck in finding this using google search, and this thread has over 23 pages to search from....

I installed the plugin 'Google reCAPTCHA for Zen Cart v3.4' on 'Zen Cart v1.3.7.1', using the instructions for Instalation for Zen Cart Versions prior to 1.5.1 and a little refactoring to remove namespace as the client is using php4. I am aware that its an old version, and advicing me to update is not a good answer, unless you know for sure that this will not work on php4. I got it to load on the contact us page but the captcha is not verifying the captcha. The form is submitable when the box is completely ignored. I skimped some of the answers here but they have not worked, does anyone have any experience with this, the solution is deffinitely a big plus.