After many tries I’ve managed to re-install the latest version of My cloud.
I Have Windows 10, a 64bit Laptop (LeNovo Yoga).
Used Yamicsoft Windows 10 Manager to uninstall the previous installation of ‘MY CLOUD’ and ‘BONJOUR’ (complete clean of both).
Then I went ‘manually’ to clean any “My cloud” string on the Registry (used REGEDIT.EXE) using the ‘Find’ and ‘Find Next’ feature (it found lots of lines containing “My Cloud” and “WD…” which I deleted all of them.
Rebooted under ADMINISTRATOR, and re-install the new My Cloud software.
Rebooted and logged on the my windows account and it’s working 100%
I Hope this helps some guys, like me, desperate to have it solved.