for all peers, here is a quick how-to on how to use the offline version of help, in those cases when online access is not possible or severely limited.
1) download the corresponding help file from the LO-website, the version has to match your installed language and version number.
2) install the files locally
3) copy the local files (typically something like c:\Programs\LibreOffice\*) to ..\LibreOfficePortable\App\libreoffice\Basis\* and overwrite the target files. At the time of this writing, the folders are:
"help" "presets" "program" and "share".
4) uninstall the local help pack
It would be really nice if LibreOfficePortable had the offline help pre installed or if there was a separate portable installer for the help files.