Look for the version string. If it says or (x64) , you need the 64-bit JRE. If it says (x86) , you need the 32-bit version. Step 2: Download the 64-Bit JRE
You can obtain the necessary 64-bit JRE from several authoritative sources:
While most of LibreOffice's core functions (like word processing) work without Java, it is essential for: libreoffice 64-bit java runtime environment (jre) download
To use key features in LibreOffice, such as LibreOffice Base or certain document extensions, you must have a Java Runtime Environment (JRE) installed on your system. If you are using a 64-bit version of LibreOffice, it a 64-bit JRE to function properly; a 32-bit version will not be recognized. Step 1: Verify Your LibreOffice Architecture
Once installed, you must manually point LibreOffice to the new environment: Look for the version string
Run the downloaded .exe or .pkg file with administrator privileges.
How to install Java (JRE/JDK) so that LibreOffice could use it? Step 2: Download the 64-Bit JRE You can
Close LibreOffice completely before starting the installation.