Want to use on compute with no internet connection
It works without internet connection. I often tried it on my laptop. There is the LO 6.1.6 version on my laptop.
And you can download the Installer file on an another computer onto a portable device (thumbdrive).
And you can try the portable version of the LibreOffice too: You can ISNTALL it on a thumbdrive, and then you can use it on any (Windows) computer.
In addition to @Zizi64 :
[Portable versions](https://www.libreoffice.org/download/portable-versions/)