Hi :)
It is just that there appears to be a warning in the announcement
NOTE: This build is in a release configuration and _will_ replace your
existing LibreOffice install on Windows.
It's about 75% of the way down the announcement and not at all obvious which
is why i didn't notice it at first.
V Stuart Foote wrote
2) the resulting Microsoft Installer package sets a configuration varaible
WRITEREGISTRY to true, and that results in program details being recorded
into the Windows Registry database, overwriting any existing settings.
Sorry the correct msiexec.exe command line varaible