I sent a follow up courtesy email to a Bank Genie customer today to see how they were managing.
Here's an extract from the reply
The download and install went fine. A couple of hysterical messages from Windows 8 along the lines of it's a strange app we won't let you run it. But there is a "run it anyway" option and after that all was well.
Thank you Abi - I had a hysterical titter at that
I'm sure you've seen that in Windows 7 as well (I have). I'm glad its become common knowledge and some of us can joke about it