This is an old issue from over a year ago, there has been no legitimate fix/update from Stardock.
Disabling shadows does kind of help.
You can stop the flickering completely by disabling scaling on your monitor.
If you have a 4k monitor this is not a practical solution, but it is the only one.
I gave up on CursorFX and stopped using it and chalked it up as a waste of money.