Jim, I received the same error, using BitDefender Internet Security software.
It seems something there is identifying that as a Trojan, probably due to a 'broad' definition in the antiviral.
Downloading from the store or via Object Desktop Manager and attempting to install causes the same error (Error Code 123) to occur.
Turning off the BD software doesn't help.
"Whitelisting" via the Antiviral configuration option does not prevent this either, at least not via the BitDefender options.
I think the only solution will have to come via BitDefender changing its definition.
I.D. is aware of this problem, and has notified the right people at Stardock...and my thanks to him for doing that. 
