The LibreOffice built-in help for current UI language (English (USA)) is not installed on your computer. That statement pops up when i click on Libre help from the app menu. How do I know the right Libre help to download? I have the 6.4.2.2 x86 for my 32 bit pc. And how do I find the Libre built-in help to download? Please help, I know a very little about computer technology.
PC world is extremely large and diverse. LO app pretends to be quasi-universal. Consequently, to get relevant advice, tell us under which OS your PC runs. Do that by clicking on the edit link under your question.