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In this case, LibreOffice (of reasonably fresh version) would try to be helpful in its "JRE Required" error message, telling you that it needs specific architecture (e.g., 64-bit) of JRE. Take care that you download from the Java home page (the right architecture. When you have installed a 64-bit LibreOffice, and 32-bit JRE, LibreOffice would not be able to find and use the JRE, no matter how hard you would try it. 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. If you have 32-bit operating system, you will be offered a 32-bit installer ( Windows (32-bit)⁠ ).If your Windows is 64-bit, LibreOffice Download page by default offers you a 64-bit LibreOffice installer.To use them, a supported version of JRE/JDK must be present and configured on the system.ĭo not mistake '圆4' and 'x86' architectures: when using Windows, you need to make sure that the architecture of installed LibreOffice matches the architecture of installed JRE. The system will not install a JRE that has an earlier version than the current version.Some LibreOffice functions require Java ( JRE/ JDK). When you install the JRE, you can install only one JRE on your system at a time. To install an earlier version of the JRE, you must first uninstall the current version. To determine the current JRE version installed on your system, see Determining the JRE Version Installed on macOS. However, the system will not replace the current JRE with a lower version. When you install the JDK, it also installs the JRE. Administrator privileges are required to install the JDK and JRE on macOS. Installing the JDK and JRE on macOS is performed on a systemwide basis for all users. You cannot install Java for a single user. The following are the system requirements for installing the JDK and the JRE on macOS: