I’ve been asked to install LibreOffice in Haiti in an area where the connection is slow or non-existent at times.
You may call an installer from any storage device you downloaded it to elsewhere.
Don’t miss to also install the help package(s) exactly matching the version of the installed LibO and the UI language(s). Otherwise any attempt to get F1-Help will address the online help. (No offline help included with the LibO installer!)
A CD/DVD containing the installers is also OK, of course.