LibreOffice: Diffrence between language downloads?

What is the difference between these -
https://www.libreoffice.org/download/download/?type=win-x86_64&version=6.3.1&lang=es
vs
https://www.libreoffice.org/download/download/?type=win-x86_64&version=6.3.1&lang=en-US

I downloaded from the first link but the default language is EnglishUS.How?

Did you choose your preferred language as indicated by the red arrow in the screenshot?

when I went to https://www.libreoffice.org/download/download is said espnol.

Then it should show an option to choose the language during installation.

You mean every setup has English US, UK, Africa but when a language pack is chosen or by-default it shown something else then English it also has that language.