XF 1.5 How to upgrade captcha?

[XYZ500]

Following is being shown when someone tries to register a new account: https://prnt.sc/j5cjzg

How to fix this?

 

[Ozzy47]

The recommended course of action is to update to XF 1.5.16 or enable a different captcha. Google is no longer supporting reCAPTCHA v1.

 

[XYZ500]

The recommended course of action is to update to XF 1.5.16 or enable a different captcha. Google is no longer supporting reCAPTCHA v1.

Thanks for your reply!
Upgrading is not an option at the moment as its time-consuming. How to enable a different captcha? Please provide instruction steps. I couldn't find in the admincp an option to change it. Thanks!

 

[Ozzy47]

Selecting a CAPTCHA Type
XenForo includes support for reCAPTCHA and custom CAPTCHA questions. You may select your CAPTCHA type from the options:

1. Log in to the admin control panel.
2. Select Options.
3. Select Basic Board Information.
4. Choose the Enable CAPTCHA for Guests option and select your CAPTCHA type.