On Windows 8.1, the one that is problematic to tell from Windows 10
(because the latter also exposes its version as 603 to the msiexec),
the registry value doesn't exist at
but let's play safe and also check for "#6" value just in case.
Thanks to Mitchell <email@example.com> for the idea!
Reviewed-on: https://gerrit.libreoffice.org/65231Reviewed-by: Mike Kaganski <firstname.lastname@example.org>
Tested-by: Mike Kaganski <email@example.com>