My LibreOffice installation says that there is a new version of LibreOffice portable, but it does not seem to be available yet on portableoffice.com.
New: streamWriter (Jun 28, 2024), Platform 29.5.3 (Jun 27, 2024)
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As shown in the block above the text entry when creating a new post:
That page lists all official apps that are being worked on, and it can be seen that LibreOffice 6.1.5 is one of those.