LO org says that LO portable can function without a launcher
[LibreOffice web site](https://www.libreoffice.org/download/portable-versions/) says about LibreOffice portable, that can run without the PortableApps platform.
> LibreOffice Portable ... It is packaged in PortableApps.com format so it can work with the PortableApps.com platform
> and its automatic updater and app store, **work with other portable menus, or work by itself from a USB**, cloud or local drive.