I have disabled all AV/firwalls and run the app as admin. this happens with newly downloaded trainers and ones that worked last month.
It is well known that anti-viruses keep working in the background even when "disabled". Please whitelist the trainer executable in your anti-virus application(s).
Furthermore, you should run the trainer as administrator, not the game.
to be specific, the fable anniversary trainer is the app that wont let me open it and gives me the "this user is banned" message. I have downloaded it 4 times now
As PWizard mentioned: "Something on your system is interfering with the authentication process...".
A second ago I tested the trainer and is authenticating and working flawlessly.
A way around the online authentication process would be to use the Offline Trainer Authentication key situated here -> Link on the right side of the page.