Since that is a commercial plugin, we ask that you please go to their official support channel, so you can get support from the people who know it best: https://wpml.org/purchase/pre-sales-questions/
Forum volunteers do not have access to commercial products, so they would not know how it operates. Other community members who may have faced your issue might be able to help you, but your best bet is your product’s developer. We encourage you to use the official support venues, as it allows the developers to be aware of issues with their code and gives back to the community in a more robust way.
If you want to use Polylang instead, you can ask them at https://wordpress.org/support/plugin/polylang/
Thank you James but your tips don’t really answer my question. I just wanted to know if a website that needs to be multilanguage needs a particular WP installation or just the normal one (notwithstanding if I’ll use a premium or free plugin).
There’s nothing built into WordPress that makes it multilingual, so I’m not sure what you’re referring to.
Adding one of these plugins is what does that.
Maybe you’re using a third-party installer that has a revenue sharing deal with WPML, but we wouldn’t have any knowledge or control over that.
I always use the Softacolous installer within cPanel, which offered the option multlingual/standard, that’s why I always wondered about the difference. However, I think you have answered my doubts and I thank you for that.