Tried that with the same result. When I try and enable Fences there is a spinning circle for a few seconds.
I don't know if it means anything but if I go to "add or remove programs" it shows Fences 2 as well as Fences 4. If I try to remove Fences 2 it comes up that I am removing Fences 4. When I originally removed Fences 2 (I had installed Fences 3) it came up with an error that something was in use. When I tried again it said it couldn't find the program.
This is what I have done.
I did a clean install of Windows 10
Installed Fences 2
Installed Fences 3 (It was an upgrade which is why I installed Fences 2 1st)
Tried to remove Fences 2 with an error as stated earlier
Purchased Fences 4 and removed Fences 3
Hope that all makes sense