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When using Windows, you need to make sure that the architecture of installed LibreOffice matches the architecture of installed JRE. If your Windows is 64-bit, LibreOffice Download page by default offers you a 64-bit LibreOffice installer. It is designated as Windows (64-bit)⁠Wikipedia logo v3.svg. If you have 32-bit operating system, you will be offered a 32-bit installer (Windows (32-bit)⁠Wikipedia logo v3.svg). You may check the architecture of installed LibreOffice in menu Help ▸ About LibreOffice, where the version string looks like "Version: (x64)" for 64-bit version, and "Version: (x86)" for 32-bit version.