Hi ztminhas. At the moment, we only make LibreOffice Portable available as 32-bit packages. We have 4 packages, a multilingual standard (with the most common languages) and a multilingual all (with all languages) for both Fresh and Still.
Most apps we distribute are the 32-bit packages as they will work on Windows 32-bit, Windows 64-bit and Windows ARM. For most apps, there is no advantage to using the 64-bit package over the 32-bit one. For apps where these is a requirement (system tools that use separate drivers for different Windows variants) or a distinct advantage (7-Zip will handle large archives about 9% faster) and the added size is worth it, we’ll package a ‘dual mode’ app with both the 32-bit and 64-bit versions and automatically switch between them. At the moment, LibreOffice doesn’t fall within this rule of thumb.
If there is a specific use case and advantage to using the 64-bit version that we may have missed, please let us know in our forums and it may be considered. This also might change over time as users and apps move on from Windows 7 (which had more 32-bit installs) to Windows 10 (mostly 64-bit) and 11 (64-bit only).