It's happened again. the latest beta r474 won't install on a particular PC.
I think that the issue is that something has gone wrong with the Windows UAC on this particular machine. When I open the r474 executable on another machine, I get the Windows 8.1 pop-up warning me that there may be a security risk with the program. I choose "run anyway" and the program installs.
On the problem PC (also running Win 8.1) I don't get the pop-up, just a spinning circle in the File Explorer, and that's it.
So the issue probably isn't with HomeGenie at all, but with UAC on this particular machine.