Sorry to hear you are having problems with the trial.
A problem that can occur is when the splash screen (with the update options) opens partially outside your screen area. When this happens the close button will not be visible to click. However it is normally easy to resolve the problem by hitting the Enter/Return key on your keyboard. This should close the splash screen and allow you to maximise the iClone window to fit your screen.
Do give this a try but if it doesn't resolve the problem, please post a screenshot showing the issue on screen so we can see what is going on. Thanks.