Remove Captcha from Product Reviews

When benchmarking my website performance on gtmetrix, the download of the captcha image seems to cause a delay.

I would be happy to remove the captcha and just have reviews from logged-in customers.

There are a few extensions with links below that would work well, however they both do not seem to be supported unfortunately ...
http://www.opencart.com/index.php?route ... on_id=4655
http://www.opencart.com/index.php?route ... n_id=13929

Any other options?

This one is for 1.5.6.1, which would almost certainly work for the latest version without modification.
http://www.opencart.com/index.php?route ... n_id=13929

Even with a custom theme? Looks like the developer has abandoned support.

Pm Sent.