Have just received this reply from Juergen Freiwald at RR&Co.
"Unfortunately there is still a problem in the installation package of the
64-bit version (not in the actual software). This means that the 64-bit
version cannot currently be used with LocoNet-based systems (Digitrax,
Uhlenbrock IB II & Co., Z21 LocoNet connection).
However, the 32-bit version can be used without any problems as before (i.e.
as in version 9, where there was only 32-bit). Therefore, users with such
systems should use the 32-bit variant for the time being."
Just installed the 32 Bit version and it does indeed connect and operate normally.
Alex Thomson