Hi Val,
It sounds like that you have installed it correctly as you can sign in and attempt to download your account.
The issue you may be running in to is that the account you are attempting to download may be more than what the Ace Desktop is currently capable of downloading. I do know that this limitation should be resolved with V2 of the Desktop tool that is currently undergoing internal testing.
I am currently testing this limitation from my side and will update with conformation that it is working correctly.
Thank you,
Brian H - MSFT