If you have AD cmdlets 1.0.3 already installed and are moving to 1.0.4 now there is a gotcha to keep in mind:
To make sure that the upgrade works fine it is highly recommended that you uninstall 1.0.3 before installing 1.0.4.
I’ve seen on some of computers upgrade kind of going – you can successfully finish the setup, etc. – but then when you try to actually use the cmdlets they would not run. Clean installation seems to work just fine in all cases.
Sorry for the inconvenience.