With the flatfly build, you can get more debugging info to find out what's wrong as follows:
try to run it while holding down the SHIFT key. In the resulting console, type 'electrum' and hit Enter.
Do you get any error messages?
Try to same test with typing 'python'
I don't have Python installed. I thought these are standalone clients?
Nothing after 1.6.2 works. The shift key does not help, the client does not even start. There is no console. The process shows for a second in taskmanager, then goes away.
The official clients do the same thing, up to 1.8.1, whether standalone or installed.
Are these all 64bit versions???