WooCommerce product permalink changed

the easiest and best way to do that is to edit your .htaccess file.

Your .htaccess file is located in your FTP under the folder public_html (usually).

This way, when a user is trying to access your old url /producto/
it will immediately change to /product/ as a 301 permanent redirect.

In that file, you will see these lines-

RewriteEngine On
RewriteBase /

After those line, try adding this line-

RewriteRule ^producto/(.*) product/$1 [R=301,L]

I didn’t test this code but i believe it should do the trick