

LibreOffice can only use JRE with matching architecture: i.e., 64-bit LibreOffice can only use 64-bit JRE, and 32-bit LibreOffice can only use 32-bit JRE. You may check the architecture of installed LibreOffice in menu Help ▸ About LibreOffice, where the version string looks like "Version: 6.4.5.2 ( 圆4)" for 64-bit version, and "Version: 6.4.5.2 ( x86)" for 32-bit version.

Some LibreOffice functions require Java ( JRE/ JDK).
