I can not save changes when creating a recaptcha

Hello, I have a problem with ChronoForms V. 4.0.8, I get emails like this:

Nombre *  {input_text_1} 
N.I.F./C.I.F. *  {input_text_2} 
Telf 1 *  {input_text_3} 
Telf 2  {input_text_4} 
Domicilio  {input_text_5} 
Provincia  {input_text_6} 
Población  {input_text_7} 
C.P. *  {input_text_8} 
F. Nacimiento *  {input_text_9} 
F.Permiso de Conducir*  {input_text_10} 
Correo Electrónico*  {email}

In the FAQS section, I have seen that this bug is solved with a Recaptcha in the form, but I have two problems:
1. Following the video of creation of a Recaptcha on the form, I can not get it displayed (https://www.chronoengine.com/faqs/55-chronoforms/cfv4/cfv4-anti-spam/2595-how-do- i-add-a-recaptcha-to-my-form)
2. Sometimes ChronoForms does not save the changes I make in the form.
Can you please help me correct these mistakes?
Greetings and thank you.

Hi cobrerosweb,
​
Google no longer supports the early version of ReCaptcha shown in the video. you will I think need to update to the current version,
​
That said, it may be better to rebuild your form in CFv6 which includes the latest version of ReCaptcha.
​
Bob