SD_FAN,
To install the full 4.0b, you won't need the OS file SD1STAN.exe - just ALL the Pbank files associated with 4.0a (you should have these in your STANDARD Folder so you can reload them from there).
4.0b now gives you both the new 4.0 and old 3.0 harmony features - you select which one you want from the Harmony screen by using F1 to toggle between both!
Thanks,
AJ